OPINION
BRYNER, Chief Judge.
In this case, we are asked to decide whether a retroactive extension of the statute of limitations in a criminal case violates the constitutional prohibition against ex post facto laws. We conclude that it does.
On May 17, 1985, Robert C. Creekpaum was indicted for one count of sexual assault in the first degree in violation of AS 11.41.410(a). The assault was alleged to have occurred more than five years previously, on March 12,1980. At that time, the general five-year statute of limitations was applicable to the offense. See AS 12.10.-010. In 1983, the Alaska legislature enacted AS 12.10.020(c), which extended the five-year period in certain cases of sexual assault and abuse:
Even if the general time limitation has expired, a prosecution under AS 11.41.-410-11.41.460 for an offense committed against a person under the age of 16 may be commenced within one year after the crime is reported to a peace officer or the person reaches the age of 16, whichever occurs first. This subsection does not extend the period of limitation by more than five years.
In enacting this statute, the legislature expressly provided that the enlarged period of limitation was to apply retroactively to offenses committed during the five years immediately preceding the statute’s effective date, October 17, 1983.1
Creekpaum moved for dismissal of his indictment on the ground that it was barred by the statute of limitations. He argued that AS 12.10.020(c) could not be applied to his case without violating the constitutional prohibition against ex post [559]*559facto laws. The parties agreed that if the original five-year statute of limitations applied to Creekpaum, the charge would be time-barred.
Superior Court Judge Walter L. Carpene-ti granted Creekpaum’s motion for dismissal, concluding that retroactive application of the enlarged statute of limitations would violate the ex post facto prohibition. The state now appeals.
The United States and Alaska Constitutions prohibit ex post facto laws. See U.S. Const. Art. 1, § 10, cl. 1; Alaska Const. Art. 1, § 15. To be considered an impermissible ex post facto law, a criminal statute, “must be retrospective, that is, it must apply to events occurring before its enactment and it must disadvantage the offender affected by it.” Weaver v. Graham, 450 U.S. 24, 29, 101 S.Ct. 960, 964, 67 L.Ed.2d 17 (1981) (footnotes omitted). “A law need not impair a ‘vested’ right to violate the ex post facto prohibition.” Id. To be prohibited, however, the law must be substantive; no ex post facto violation occurs if the law is merely procedural and does “not increase the punishment, nor change the ingredients of the offense or the ultimate facts necessary to establish guilt.” Hopt v. Utah, 110 U.S. 574, 590, 4 S.Ct. 202, 210, 28 L.Ed. 262 (1884). The central issue in this case is whether a criminal statute of limitations is substantive or procedural.
In granting Creekpaum’s motion to dismiss, Judge Carpeneti concluded that an unfavorable amendment of the statute of limitations amounted to a substantive change in the law. Judge Carpeneti first looked to ex post facto cases decided by the United States Supreme Court. The Supreme Court has never decided the precise issue presented here. However, Judge Carpeneti did find guidance in general principles articulated by the Court in its ex post facto cases. The judge cited Kring v. Missouri, 107 U.S. 221, 2 S.Ct. 443, 27 L.Ed. 506 (1883), for the rule that the ex post facto issue hinges on whether a retroactive change in the law is substantive or procedural. A substantive right may not be abridged retroactively; this rule cannot be obviated by merely labeling as procedural a change in the law that is actually substantive. Kring, 107 U.S. at 240-41, 2 S.Ct. at 458-59. Judge Carpeneti found Weaver v. Graham, 450 U.S. at 29, 101 S.Ct. at 964, one of the Court’s most recent ex post facto cases, to be particularly significant. There, the Court held that, for purposes of ex post facto analysis, it is irrelevant whether a right has “vested.”
Judge Carpeneti next addressed case law from the federal circuits and from various state courts that have considered the issue; this case law points almost unanimously to the conclusion that a statute of limitations is procedural and not substantive. The judge correctly pointed out, however, that the seminal case on the issue, Falter v. United States, 23 F.2d 420 (2d Cir.), cert. denied, 277 U.S. 590, 48 S.Ct. 528, 72 L.Ed. 1003 (1928), relies on the vested rights analysis that was rejected in Weaver v. Graham. He also correctly noted that most of the state and federal cases decided since Falter have simply cited that case as controlling authority, without questioning the validity of its rationale. For this reason, Judge Carpeneti did not find the case law from other jurisdictions to be persuasive.
Finally, Judge Carpeneti turned to Alaska case law. The judge noted that our supreme court, in Nolan v. Sea Airmotive, Inc., 627 P.2d 1035, 1045 (Alaska 1981), characterized the statute of limitations as substantive, albeit in a slightly different context. Relying on Nolan, Judge Carpen-eti concluded that a criminal statute of limitations creates a substantial right and that an unfavorable, retrospective change in such a statute is a prohibited ex post facto law.
On appeal, the state argues that Judge Carpeneti erred in reaching this conclusion. The state contends, first, that the court’s decision is based on a mistaken interpretation of the difference between a “substantive” and a “procedural” right for purposes of ex post facto analysis. Second, the state asserts that the decision goes against the [560]*560clear weight of authority from other jurisdictions. Finally, the state maintains that the decision is not supported by Alaska case law. We will address each of the state’s arguments.
The state places its primary reliance on the argument that Judge Carpeneti was mistaken in his view of the difference between a substantive and a procedural change in the law. According to the state, changes in the law are substantive only if they directly alter the elements of an offense or the punishment prescribed therefor:
The state believes that, for ex post facto purposes, the distinction between “substantive” criminal law and “procedural” law is this: “substantive” law refers to statutes ... which define what acts are criminal, or which prescribe the punishments for criminal acts ... “procedural” law refers to all other aspects of the law affecting criminal proceedings.
With this premise as its starting point, the state attributes significance to the fact that Judge Carpeneti’s opinion used the word “substantial” interchangeably with the word “substantive.” In the state’s view, this indicates a mistaken belief on Judge Carpeneti’s part that a “substantive” change in the law includes any change that might make a difference in the outcome of a case, regardless of whether the change implicates the elements of the offense or the penalties provided therefor. The state reasons that, because a change in the period within which charges may be filed does not alter the elements of an offense, it is not “substantive” for ex post facto purposes, even though it might be “substantial” in its importance to the outcome of a criminal case.
To a limited extent, we agree with the state’s argument. Not all changes adversely affecting a defendant can properly be classified as substantive for purposes of ex post facto analysis. The state is correct in asserting that the word “substantive” must be read, in context, to refer to the substance of the offense charged. A substantive change in the law, then, is one that places the defendant at a disadvantage in relation to the substance of the offense charged or the penalties prescribed for that offense. As the United States Supreme Court stated in Thompson v. Utah, 170 U.S. 343, 351, 18 S.Ct. 620, 42 L.Ed. 1061 (1898) (footnotes omitted): “[A] statute is ex post facto which ... in its relation to the offense or its consequences, alters the situation of the accused to his disadvantage.”
Beyond this point, however, we part company with the state’s definition of a substantive change in the law. Specifically, we reject the state’s assertion that a change can be substantive only if it directly alters the elements of an offense or its prescribed punishment. In our view, this argument says both too much and too little — too much because the Supreme Court’s ex post facto cases do not support it; too little, because it overlooks the fact that the Court, in deciding whether a change is “substantive,” has often considered whether that change affects a “substantial” right of the accused.
While the United States Supreme Court has never expressly rejected an interpretation of the ex post facto prohibition as narrow as the one proposed by the state, neither has it adopted such an interpretation. Had the Court wanted to restrict the ex post facto clause to laws directly altering the elements of an offense or its prescribed penalties, it could have said so in plain and unequivocal language — language similar to that used by the state in its brief. Yet the Court has never cast the ex post facto prohibition in such an ironclad mold.
Certainly, the boundaries of the ex post facto prohibition have been narrowed by the Court over the years. Its earliest formulations of the prohibition were extremely broad. For example, in Calder v. Bull, 3 U.S. (3 Dall.) 386, 390, 1 L.Ed. 648 (1798), Justice Chase described the prohibition as applying to:
1st. Every law that makes an action done before the' passing of the law, and which was innocent when done, criminal _ 2nd. Every law that aggravates a crime or makes it greater than it was [561]*561when committed. 3rd. Every law that ... inflicts a greater punishment than the law [imposed for] the crime when committed. 4th. Every law that alters the legal rules of evidence, and receives less, or different testimony, than the law required at the time of the commission of the offense, in order to convict the offender.
See also Kring v. Missouri, 107 U.S. 221, 2 S.Ct. 443, 27 L.Ed. 506 (1883).
The court later began to distinguish between substantive and procedural laws. Reflective of the earliest movement to narrow the ex post facto prohibition is Justice Matthews’ dissent in Kring v. Missouri, 107 U.S. at 250-51, 2 S.Ct. at 467-68:
In respect to criminal offenses it is undoubtedly a maxim of natural justice, embodied in constitutional provisions, that the quality and consequences of an act shall be determined by the law in force when it is committed, and of which, therefore, the accused may be presumed to have knowledge, so that the definition of the offense, the character and degree of its punishment, and the amount and kind of evidence necessary to prove it, cannot be changed to the disadvantage of the party charged, ex post facto. And this equally applies to, because it includes, the matters which, existing at the time and constituting part of the transaction, affect its character, and thus form grounds of mitigation or defense; for the accused is entitled to the benefit of all the circumstances that attended his conduct, according to their legal significance, as determined at the time. All these are incidents that belong to the substance of the thing charged as a crime, and therefore come within the saving which preserves the legal character of the principal fact. But matters of possible defense, which accrue under provisions of positive law, which are arbitrary and technical, introduced for public convenience or from motives of policy, which do not affect the substance of the accusation or defense, and form no part of the res gestae, are continually subject to the legislative will, unless, in the mean time, by an actual application to the particular case, the legal condition of the accused has been actually changed.
The distinction between substance and procedure suggested in Justice Matthews’ dissent is considerably broader than the distinction proposed here by the state, since Justice Matthews would include as “substantive” not only “the definition of the offense,” but also “the amount and kind of evidence necessary to prove it....” Id.
In subsequent ex post facto decisions, the Court seems to have adopted a position consistent with that taken by the dissent in Kring. See, e.g., Thompson v. Missouri, 171 U.S. 380, 18 S.Ct. 922, 43 L.Ed. 204 (1898); Thompson v. Utah, 170 U.S. 343, 18 S.Ct. 620, 42 L.Ed. 1061 (1898); Duncan v. Missouri, 152 U.S. 377, 14 S.Ct. 570, 38 L.Ed. 485 (1894); Hopt v. Utah, 110 U.S. 574, 4 S.Ct. 202, 28 L.Ed. 262 (1884). In keeping with the dissent in Kring, however, the Court’s later cases do not strictly limit the ex post facto prohibition to laws altering the elements of or the punishment for an offense. In each case, the Court’s language suggests that the prohibition is significantly broader. In Thompson v. Utah, for example, the Court said:
It is sufficient now to say that a statute belongs to that class [the class of prohibited ex post facto laws] which by its necessary operation and “in its relation to the offense, or its consequences, alters the situation of the accused to his disadvantage.” Of course, a statute is not of that class unless it materially impairs the right of the accused to have the question of his guilt determined according to the law as it was when the offense was committed. And, therefore, it is well settled that the accused is not entitled of right to be tried in the exact mode, in all respects, that may be prescribed for the trial of criminal cases at the time of the commission of the offense charged against him. Cooley in his Treatise on Constitutional Limitations ... says: “But so far as mere modes of procedure are concerned, a party has no more right, in a criminal than in a civil action, to [562]*562insist that his case shall be disposed of under the law in force when the act to be investigated is charged to have taken place. ... The legislature may abolish courts and create new ones, and it may prescribe altogether different modes of procedure in its discretion, though it cannot lawfully, we think, in so doing, dispense with any of those substantial protections with which the existing law surrounds the person accused of the crime.” ... This court, in Duncan v. Missouri, said that statutes regulating procedure, if they leave untouched all the substantial protections with which existing law surrounds the person accused of crime, are not within the constitutional inhibition of ex post facto laws. But it was held in Hopt v. Utah ... that a statute that takes from the accused a substantial right given to him by the law in force at the time to which his guilt relates would be ex post facto in its nature and operation, and that legislation of that kind cannot be sustained simply because, in a general sense, it may be said to regulate procedure.
Thompson v. Utah, 170 U.S. at 351-52, 18 S.Ct. at 623 (citations omitted; emphasis added). Similarly, in Mallett v. North Carolina, 181 U.S. 589, 597, 21 S.Ct. 730, 733, 45 L.Ed. 1015 (1900) (emphasis added), the Court used the following language in rejecting an ex post facto claim:
Applying the principles established by these cases [prior Supreme Court ex post facto cases] to the facts of the present case, we think it may be concluded that the legislation of North Carolina in question did not make that a criminal act which was innocent when done; did not aggravate an offense or change the punishment and make it greater than when it was committed; did not alter the rules of evidence, and require less or different evidence than the law required at the time of the commission of the offense; and did not deprive the accused of any substantial right or immunity possessed by them at the time of the commission of the offense charged.
Even the Court’s narrowest formulations of the ex post facto prohibition are significantly broader than the restrictive formula urged by the state in this case. For example, Hopt v. Utah, 110 U.S. at 589-90, 4 S.Ct. at 209-10 (emphasis added), the Court, in holding that a change in the hearsay rules was procedural rather than substantive, stated:
The crime for which the present defendant was indicted, the punishment prescribed therefor, and the quantity or degree of proof necessary to establish his guilt, all remained unaffected by the subsequent statute. Any statutory alteration of the legal rules of evidence which would authorize conviction upon less proof, in amount or degree, than was required when the offense was committed, might, in respect to that offense, be obnoxious to the constitutional inhibition upon ex post facto laws.
See also Dobbert v. Florida, 432 U.S. 282, 97 S.Ct. 2290, 53 L.Ed.2d 344 (1977).
Furthermore, the Court has plainly stated that the distinction between a substantive and a procedural change in the law cannot be reduced to a simple formula but should instead be left to determination on a case-by-case basis. Thus, in Beazell v. Ohio, 269 U.S. 167, 46 S.Ct. 68, 70 L.Ed. 216 (1925), the Court, although holding that a change in the law governing severance in criminal trials was procedural, cautioned:
[T]here may be procedural changes which operate to deny to the accused a defense available under the laws in force at the time of the commission of his offense, or which otherwise affect him in such a harsh and arbitrary manner as to fall within the constitutional prohibition. But it is now well settled that statutory changes in the mode of trial or the rules of evidence, which do not deprive the accused of a defense and which operate only in a limited and unsubstantial manner to his disadvantage, are not prohibited....
Just what alterations of procedure will be held to be of sufficient moment to transgress the constitutional prohibition cannot be embraced within a formula or [563]*563stated in a general proposition. The distinction is one of degree. But the constitutional provision was intended to secure substantial personal rights against arbitrary and oppressive legislation, and not to limit the legislative control of remedies and modes of procedure which do not affect matters of substance.
269 U.S. at 170-71, 46 S.Ct. at 68-69 (citations omitted).2
The narrow reading of the ex post facto clause suggested by the state in this case is inconsistent with more than just the general language of the Supreme Court’s decisions. In at least two cases, the Court’s holdings are squarely at odds with the notion that the ex post facto clause applies only to statutes that alter the elements of an offense or the punishments prescribed for that offense.
In Kring v. Missouri, 107 U.S. 221, 2 S.Ct. 443, 27 L.Ed. 506 (1883), Kring was originally charged with first-degree murder. He eventually pled guilty to second-degree murder, and appealed the validity of his sentence. At the time of the offense, Missouri law absolutely barred prosecution for first-degree murder once a plea of guilty had been entered to second-degree murder. During the pendency of Kring’s appeal, the law changed. Kring’s appeal was successful, and his sentence was vacated. On remand, Kring was tried for first-degree murder and was convicted. A majority of the United States Supreme Court concluded that Kring was entitled to the benefit of the law in effect at the time of his offense. The Court concluded that the challenged statute involved a “substantial right which the law gave the defendant at the time to which his guilt relates.... ” 107 U.S. at 232, 2 S.Ct. at 452.
In Thompson v. Utah, 170 U.S. 343, 18 S.Ct. 620, 42 L.Ed. 1061 (1898), Thompson was entitled to a jury of twelve persons under federal law applicable at the time of the alleged crime. Prior to trial, Thompson became subject to a state law that allowed trial before a jury of eight persons. The Court in Thompson v. Utah held that the retroactive change in jury size was prohibited by the ex post facto clause because it took “from the accused a substantial right belonging to him when the offenses were committed.” 170 U.S. at 351-52, 18 S.Ct. at 623.
Thus, in both Kring and Thompson v. Utah, the Court invalidated retroactive laws that had no direct effect on the elements of the offense or on the applicable penalty. While the vitality of these decisions may be subject to some doubt, neither case has been expressly overruled. Their perseverance as nominally valid precedent lends weight to the view that the limits of the ex post facto clause cannot be drawn as narrowly as the state would suggest.
We therefore decline to hold that a law is substantive for ex post facto purposes only when it alters the elements of an offense or its prescribed penalties. In our view, a substantive change in the law is [564]*564one that works a disadvantage to the accused either directly, by altering the requisite elements of the offense, or indirectly, by impairing important rights that are related to the substance of the offense— those rights meant to assure fairness in the ultimate adjudication of guilt or innocence. As the Supreme Court has held: “It is sufficient now to say that a statute belongs to ... [the protected] class which by its necessary operation and ‘in its relation to the offense, or its consequences, alters the situation of the accused to his disadvantage.’ ” Thompson v. Utah, 170 U.S. at 351, 18 S.Ct. at 623 (citations omitted).3
We must next inquire whether the ex post facto clause, so construed, encompasses a retroactive change in a criminal statute of limitations. This inquiry leads directly to the state’s second argument. The state contends that the compelling weight of authority in other jurisdictions establishes that, for ex post facto purposes, a criminal statute of limitations is procedural rather than substantive. The state also contends that Alaska cases, although they do not address the precise issue, point to the same conclusion.4
The leading case to decide the effect of a retroactive change in a criminal statute of limitations is Falter v. United States, 23 F.2d 420 (2d Cir.), cert. denied, 277 U.S. 590, 48 S.Ct. 528, 72 L.Ed. 1003 (1928). There the court, in an opinion by Judge Learned Hand, concluded that extending a statute of limitations while the original statute is still running is permissible, but that revival of an already expired statute would be impermissible:
Certainly it is one thing to revive a prosecution already dead, and another to give it a longer lease of life. The question turns upon how much violence is done to our instinctive feelings of justice and fair play. For the state to assure a man that he has become safe from its pursuit, and thereafter to withdraw its assurance, seems to most of us unfair and dishonest. But, while the chase is on, it does not shock us to have it extended beyond the time first set, or if it does, the stake forgives it.
23 F.2d at 425-26.
Judge Hand’s conclusory reference to “our feelings of justice and fair play” has [565]*565been criticized by academic commentators. See L. Tribe, American Constitutional Law, at 484 n. 9 (1977); Note, Ex Post Facto Limitation on Legislative Power, 73 Mich.L.Rev. 1491, 1512 n. 78 (1975). Nevertheless, almost all courts that have considered this issue have reached the same result. Most of these decisions place unquestioning reliance on the vested rights analysis articulated in Falter. They reason that until a defendant has a vested right to be free from prosecution because the statute of limitations has expired, it is not unfair for the legislature to extend the statute. See, e.g., Hill v. State, 171 S.W.2d 880, 884 (Tex.Crim.App.1943); People v. Smith, 171 Cal.App.3d 997, 217 Cal.Rptr. 634, 636 (5 Dist.1985); People v. Sample, 161 Cal.App.3d 1053, 208 Cal.Rptr. 318, 320 (5 Dist.1984); People v. Midgley, 714 P.2d 902 (Colo.1986); People v. Holland, 708 P.2d 119 (Colo.1975); People v. Isaacs, 37 Ill.2d 205, 226 N.E.2d 38, 46-47 (1967); State v. Merolla, 100 Nev. 461, 686 P.2d 244 (1984); State v. Norton, 675 P.2d 577, 586 (Utah 1983), cert. denied, 466 U.S. 942, 104 S.Ct. 1923, 80 L.Ed.2d 470 (1984).
In Weaver v. Graham, 450 U.S. 24, 101 S.Ct. 960, 67 L.Ed.2d 17 (1981), however, the United States Supreme Court refused to apply the vested rights theory to ex post facto issues, holding that, while the concept of vested rights is a useful one for due process analysis, it is essentially irrelevant to the question of whether a change in the law is substantive or procedural for ex post facto purposes. Weaver dealt with a statute altering the amount of “good time” credit received by Florida prisoners. Considering the effect of the challenged legislation, the Supreme Court stated:
The presence or absence of an affirmative, enforceable right is not relevant, however, to the ex post facto prohibition, which forbids the imposition of punishment more severe than the punishment assigned by law when the act to be punished occurred. Critical to relief under the Ex Post Facto Clause is not an individual’s right to less punishment, but the lack of fair notice and governmental restraint when the legislature increases punishment beyond what was prescribed when the crime was consummated. Thus, even if a statute merely alters penal provisions accorded by the grace of the legislature, it violates the Clause if it is both retrospective and more onerous than the law in effect on the date of the offense.
Weaver v. Graham, 450 U.S. at 30-31, 101 S.Ct. at 965 (footnote omitted).
Weaver significantly erodes the rational underpinnings of Falter and its progeny. Moreover, as Judge Carpeneti correctly noted, almost all of the cases on this issue that have not expressly adopted Falter ⅛ vested rights analysis have either offered no explanation for their rulings or have cited other cases that do rely on the vested rights analysis. See, e.g., United States ex rel Masserella v. Elrod, 682 F.2d 688, 689 (7th Cir.1982), cert. denied, 460 U.S. 1037, 103 S.Ct. 1426, 75 L.Ed.2d 787 (1983); Clements v. United States, 266 F.2d 397, 399 (9th Cir.), cert. denied, 359 U.S. 985, 79 S.Ct. 943, 3 L.Ed.2d 934 (1959); People v. Pfitzmayer, 72 Misc.2d 739, 340 N.Y.S.2d 85, 87-88 (N.Y.Co.Ct.1972) (quoting People ex rel Reibman v. Warden of County Jail at Salem, 242 A.D. 282, 275 N.Y.S. 59 (1934).
Only Florida has squarely held that a criminal statute of limitations vests a substantive right and is not a procedural matter. State ex rel Manucy v. Wadsworth, 293 So.2d 345, 347 (Fla.1974). In Manucy the Florida court stated:
A review of the authorities indicates that the statute of limitations in force and effect at the time of the incident giving rise to the criminal charges is controlling in determining whether prosecution has been timely commenced.
See also Rubin v. State, 390 So.2d 322 (Fla.1980).
The state vigorously criticizes Manucy, arguing that the authorities cited in that case do not support its conclusion and that, in any event, the decision was result-oriented. Indeed, the state’s argument has some merit. On its facts, Manucy is a curious [566]*566case. The defendant was charged in 1972 with a murder committed in 1968. At the time of the offense, murder was a capital crime. There was no statute of limitations for capital crimes, but noncapital offenses were required to be prosecuted within two years of their commission. In July of 1972, the United States Supreme Court decided Furman v. Georgia, 408 U.S. 238, 92 S.Ct. 2726, 33 L.Ed.2d 346 (1972), effectively invalidating Florida’s death penalty statute. The Florida legislature was unable to reenact a new death penalty provision until October of 1972. Manucy was arrested and charged in the interim between the decision in Furman and the date of enactment of the new statute. He argued that the two-year statute of limitations for non-capital offenses should apply to him, barring prosecution. State ex rel Manucy v. Wadsworth, 293 So.2d at 346-47. The Florida Supreme Court disagreed, concluding that the statute of limitations conferred a substantive right, which attached at the time of the alleged crime. Id. at 347-48.
Despite the peculiar factual circumstances of Manucy, we believe the case has at least some persuasive force. Even though the effect of its decision was to allow the defendant to be prosecuted, the Florida Supreme Court expressly recognized that its holding would in most cases have the effect of barring prosecutions, since it would preclude retroactive application of extensions in the statute of limitations. Moreover, the Florida court’s view that a statute of limitations is a substantive right finds general support in other states, though not in the context of an ex post facto analysis. See, e.g., State v. French Funeral Home, 185 N.J.Super. 385, 448 A.2d 1037, 1039 (1982); People v. Zamora, 18 Cal.3d 538, 134 Cal.Rptr. 784, 557 P.2d 75, 80 (1976); State v. Michael, 2 Md.App. 750, 237 A.2d 782, 785 n. 4 (1968); State v. Fogel, 16 Ariz.App. 246, 492 P.2d 742, 744 (1973).
On balance, we find the case law from other jurisdictions to be inconclusive. Apart from Falter’s vested rights analysis, which, in retrospect, seems questionable, we find little in the case law to persuade us of a sound basis for concluding that a criminal statute of limitations must be regarded as merely procedural for ex post facto purposes. We turn next for guidance to the Alaska cases.
Although the Alaska Supreme Court has never decided the applicability of the ex post facto clause to a retrospective extension of the statute of limitations, it has held, in another context, that a civil statute of limitations is substantive, not procedural. See Nolan v. Sea Airmotive, Inc., 627 P.2d 1035 (Alaska 1981).
The precise issue in Nolan was whether a civil statute of limitations was a matter of substantive law within the legislature’s authority or a procedural matter within the supreme court’s rule-making powers. Id. at 1045. After noting the difficulty of characterizing any law as entirely procedural or substantive, the court concluded that the statute of limitations was substantive:
It is generally recognized that the purpose of statutes of limitations is to encourage promptness in the prosecution of actions and thus avoid the injustice which may result from prosecution of stale claims. Statutes of limitations attempt to protect against the difficulties caused by lost evidence, faded memories and disappearing witnesses.
Id. (quoting Byrne v. Ogle, 488 P.2d 716, 718 (Alaska 1971)).
The state attempts to distinguish the holding in Nolan, arguing that a statute which is substantive for purposes of the court’s rule-making authority is not necessarily substantive for purposes of the ex post facto clause. We recognize that the issue in Nolan differed from the issue presented in this case. And as the supreme court pointed out in Nolan, the distinction between substance and procedure may well differ with the context in which that distinction must be drawn. Nevertheless, Nolan provides useful guidance because it underscores the significance of the statute of limitations as a legislatively conferred right intended to assure fairness in the adjudicative process.
[567]*567The fact that Nolan involved a civil rather than a criminal statute of limitations does not diminish its significance. To the contrary, other cases decided by our supreme court strongly suggest that the statute of limitations’ role as a safeguard for the accused in criminal cases is particularly significant. Thus, the court has held that the criminal statute of limitations is jurisdictional, barring the superior court’s authority to try a case, even with the consent of the accused. See Padie v. State, 557 P.2d 1138, 1140 (Alaska 1976). See also State v. Williams, 681 P.2d 313, 314-19 (Alaska 1984).
Other courts have also expressed the view that the statute of limitations plays a particularly important role in criminal cases because it protects the accused against unfair disadvantage:
Statutes of limitation in criminal cases are designed primarily to protect the accused from the burden of defending himself against charges of long completed misconduct. Unlike a statute of limitation in a civil case, a criminal statute of limitation is not a mere limitation upon the remedy, but a limitation upon the power of the sovereign to act against the accused.
State v. Fogel, 16 Ariz.App. 246, 492 P.2d 742 (1972) (citation omitted). See also Price v. Maxwell, 140 Ariz. 232, 681 P.2d 384 (1984).
In further opposition to Nolan v. Sea Airmotive, Inc., the state cites State v. Williams, 681 P.2d 313, 314-19 (Alaska 1984). In Williams, the Alaska Supreme Court held that the speedy trial provision of Criminal Rule 45 was procedural rather than substantive, and that it was therefore within the scope of the court’s rule-making power. The court reasoned that the speedy trial rule merely operated as a procedural implementation of the constitutionally guaranteed right to a speedy trial.5
Here, the state likens the statute of limitations to the speedy trial rule. The state asserts that the statute of limitations is merely a procedural implementation of the constitutional right to dismissal for unreasonable preindictment delay.
In our view, the analogy is not apt. It is true that the statute of limitations, the constitutional right to a speedy trial, and the constitutional prohibition of unreasonable preindictment delay all address facets of the same broad problem: unfairness resulting from delay in criminal proceedings. Yet each legal rule is occupied with a distinctly different aspect of the general problem.
The right to a speedy trial applies only after the bringing of a formal charge. It is concerned with protecting against prolonged pretrial incarceration and against the embarrassment and uncertainty engendered by lengthy delays in the date of trial. See generally Rutherford v. State, 486 P.2d 946 (Alaska 1971); Glasgow v. State, 469 P.2d 682 (Alaska 1970).
In contrast, the prohibition against prein-dictment delay protects the accused from improper or unreasonable conduct by the government in the bringing of a criminal charge. Although this prohibition can operate to preclude conviction after a relatively short period of delay, it is triggered only if the accused can demonstrate that the delay in filing charges was unreasonable and resulted in actual prejudice. See Alexander v. State, 611 P.2d 469, 473-74; Coffey v. State, 585 P.2d 514, 519-20 (Alaska 1978).
The statute of limitations concerns itself with the opposite end of the spectrum of preindictment delay. It is concerned with defining the outer limits of delay, beyond which prosecution will no longer be tolerated, even when the government has exercised good faith in attempting to file [568]*568promptly and even when the accused is incapable of identifying specific prejudice resulting from the delay. By enacting a statute of limitations, the legislature serves notice that a person who contemplates the commission of an act which might be construed as criminal must be prepared to defend the act for the period specified in the statute, but no longer. In enacting such a statute, the legislature recognizes that basic fairness militates against requiring the accused to defend his acts once the period of limitation has expired.
It should be readily apparent, then, that the statute of limitations cannot accurately be characterized as a mere procedural implementation of the constitutional protection against unreasonable preindictment delay. While these rules are to some extent complementary in operation and effect, they function independently. Neither is a procedural implementation of a substantive right embodied in the other; each operates as a substantively distinct safeguard against delay.
Nor is it determinative that the protection against unfair preindictment delay is constitutionally mandated, while the statute of limitations is legislatively bestowed. Just as the legislature is empowered to define the elements of an offense and to create defenses applicable thereto, so it can confer on the accused related rights limiting the circumstances in which guilt may be established. When the legislature confers such rights because, in its view, they are necessary to assure the integrity of the adjudicative process and to protect the accused from the possibility of an unfair conviction, those rights are, we believe, substantive rights for ex post facto purposes.6
In summary, although we find the issue to be a close one, we are persuaded that a criminal statute of limitations is not merely procedural, but operates as a substantive right for ex post facto purposes. While such a statute does not directly establish the elements of an offense, it is closely related thereto, since it limits the circumstances under which guilt may be found and is aimed at preserving the accuracy and basic integrity of the adjudicative process in which the guilt or innocence of the accused is ultimately decided. We hold, therefore, that the ex post facto clauses of the Alaska and United States Constitutions prohibit a retrospective change in the statute of limitations in a criminal case when the change operates to the detriment of the accused.
The order of dismissal entered by the superior court is AFFIRMED.
SINGLETON, J., dissents.