BAUER, Circuit Judge.
Richard Pergler was convicted of mail fraud, money laundering, and submitting false claims in connection with a scheme to fraudulently bill Medicare for incontinence products. Before his indictment, Pergler employed attorney Paul DeMuro of La-tham & Watkins to counsel him regarding Medicare coverage for some of the products he sold. After his indictment, Pergler employed two other Latham & Watkins attorneys, Herve Gouraige and Michael Leib, to defend him. In this direct appeal, Pergler contends that his trial counsel was forced to choose between vigorously representing him and. protecting their colleague, DeMuro. This conflict of interest, Pergler argues, caused Gouraige and Leib to violate his Sixth Amendment right to effective assistance of counsel. Pergler urges us to vacate his convictions and remand the case for a new trial. We decline to do so.
I. Background
Pergler was convicted of selling non-reimbursable adult incontinence products, notably adult diapers and “fempouches” to Medicare patients, and fraudulently billing the products to Medicare. Medicare assigns products to an HPPC code group, which, among other things, indicates whether the product may be billed to Medicare. Adult diapers are assigned to a non-billable code, A4554. Pergler, however, billed “belted undergarments” and “briefs” to Medicare under billable code A4328, arguing that their status fell into a gray area.
In 1994, Pergler became aware of the fempouch, a diaper-like incontinence product with an insert to collect urine samples. At the time Pergler began selling the fem-pouch, it was a new product with an undetermined billing status. The inventor of the fempouch informed Pergler that his attorney, Joy Thomas, was working to determine the billing status of the product. Pergler retained Paul DeMuro, a Latham [1008]*1008& Watkins attorney from California, to advise him about billing the fempoueh to Medicare. DeMuro, with Thomas and Medicare expert Ron Nicholson, participated in two conference calls regarding the billable status of the fempoueh. Nicholson opined that the fempoueh was billable to Medicare, but urged Pergler to seek a final determination of its billable status from Medicare. Pergler billed the fern-pouch to Medicare before receiving a final determination.
In October of 1994, the government investigated and indicted Pergler for Medicare fraud. After Pergler’s indictment, he retained Herve Gouraige and Michael Leib, both of Latham & Watkins, as defense counsel. One week before trial, Gou-raige and Leib informed the government that they intended to mount a good faith defense. In support, they planned to call Thomas, counsel to the fempoueh manufacturer, and question her about the two conference calls.
The government was concerned that Thomas’ testimony could create a potential conflict of interest for Pergler’s attorneys. Specifically, the government theorized that Pergler relied on Thomas’ advice of counsel. The government feared that if the defense elicited Thomas’ testimony about the conference calls, it would thereby waive Pergler’s attorney-client privilege with DeMuro. If the government then called DeMuro as a witness, the defense attorneys would be in a conflict of interest position when they cross examined DeMu-ro.
The day before trial, the government filed a memorandum raising these attorney-client privilege and conflict of interest issues. The government sought to determine whether Thomas’ testimony about the two conference calls would destroy Pergler’s attorney-client privilege with De-Muro. The district court ruled that Thomas’ proposed testimony would not waive Pergler’s attorney-client privilege with De-Muro because the calls were not confidential, and thus were not subject to the privilege.
After the court’s ruling, the government asked that Pergler waive his potential advice-of-counsel defense. Attorney Gou-raige indicated to the court that he had counseled Pergler about the waiver and that Pergler waived his advice-of-counsel defense. The court engaged in a colloquy with Pergler during which it briefly explained . the potential conflict of interest and confirmed that Pergler indeed wanted to waive his advice-of-counsel defense.
The government then requested that the court appoint independent counsel to advise Pergler of his rights. Again, in a brief colloquy with the court, Pergler indicated that he was aware of his right to discuss the waiver with independent counsel. Pergler, however, declined the court’s offer to allow him time to consult with another attorney.
At trial, Pergler’s counsel called only one witness on Pergler’s behalf, the fem-pouch manufacturer. The defense did not call Thomas or DeMuro. Pergler alleges that his attorneys’ failure to call these witnesses stemmed from their conflict of interest. Further, Pergler argues that the conflict of interest forced the defense to truncate its cross-examination of Nicholson.
Pergler, with new counsel, filed a direct appeal claiming that his Latham & Watkins defense team denied him effective assistance of counsel as a direct result of their conflict of interest. Pergler chose not to use 28 U.S.C. § 2255 to bring his ineffective assistance of counsel claim; therefore, we do not have the benefit of a developed factual record.
II. Discussion
Pergler argues that the district court violated his Sixth Amendment right to effective assistance of counsel because it allowed Gouraige and Leib to defend him despite an actual or potential conflict of interest. The defendant bears the burden [1009]*1009of proof for an ineffective assistance of counsel claim because we adopt a strong presumption that counsel was effective. See United States v. Herrera-Rivera, 25 F.3d 491, 495 (7th Cir.1994) (citing Strickland v. Washington, 466 U.S. 668, 690, 104 S.Ct. 2052, 80 L.Ed.2d 674 (1984)).
To prevail, Pergler must prove that (1) his counsel’s performance was deficient and (2) the failure to provide adequate representation prejudiced his defense. See Cabello v. United States, 188 F.3d 871, 875 (citing Strickland, 466 U.S. at 687, 104 S.Ct. 2052). However, when, as here, the claim is based on a conflict of interest, the defendant can satisfy the prejudice element by proving either that his counsel (1) labored under an actual conflict of interest, see Strickland, 466 U.S. at 692, 104 S.Ct. 2052, or (2) was subject to a potential conflict of interest which the court was or should have been aware of, and which it failed to address adequately, see United States v. Fish, 34 F.3d 488, 492 (7th Cir.1994) (citing Holloway v. Arkansas, 435 U.S. 475, 484-91, 98 S.Ct. 1173, 55 L.Ed.2d 426 (1978)). We review ineffective assistance of counsel claims de novo. See Cabello, 188 F.3d at 875 (citing Spreitzer v. Peters,
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BAUER, Circuit Judge.
Richard Pergler was convicted of mail fraud, money laundering, and submitting false claims in connection with a scheme to fraudulently bill Medicare for incontinence products. Before his indictment, Pergler employed attorney Paul DeMuro of La-tham & Watkins to counsel him regarding Medicare coverage for some of the products he sold. After his indictment, Pergler employed two other Latham & Watkins attorneys, Herve Gouraige and Michael Leib, to defend him. In this direct appeal, Pergler contends that his trial counsel was forced to choose between vigorously representing him and. protecting their colleague, DeMuro. This conflict of interest, Pergler argues, caused Gouraige and Leib to violate his Sixth Amendment right to effective assistance of counsel. Pergler urges us to vacate his convictions and remand the case for a new trial. We decline to do so.
I. Background
Pergler was convicted of selling non-reimbursable adult incontinence products, notably adult diapers and “fempouches” to Medicare patients, and fraudulently billing the products to Medicare. Medicare assigns products to an HPPC code group, which, among other things, indicates whether the product may be billed to Medicare. Adult diapers are assigned to a non-billable code, A4554. Pergler, however, billed “belted undergarments” and “briefs” to Medicare under billable code A4328, arguing that their status fell into a gray area.
In 1994, Pergler became aware of the fempouch, a diaper-like incontinence product with an insert to collect urine samples. At the time Pergler began selling the fem-pouch, it was a new product with an undetermined billing status. The inventor of the fempouch informed Pergler that his attorney, Joy Thomas, was working to determine the billing status of the product. Pergler retained Paul DeMuro, a Latham [1008]*1008& Watkins attorney from California, to advise him about billing the fempoueh to Medicare. DeMuro, with Thomas and Medicare expert Ron Nicholson, participated in two conference calls regarding the billable status of the fempoueh. Nicholson opined that the fempoueh was billable to Medicare, but urged Pergler to seek a final determination of its billable status from Medicare. Pergler billed the fern-pouch to Medicare before receiving a final determination.
In October of 1994, the government investigated and indicted Pergler for Medicare fraud. After Pergler’s indictment, he retained Herve Gouraige and Michael Leib, both of Latham & Watkins, as defense counsel. One week before trial, Gou-raige and Leib informed the government that they intended to mount a good faith defense. In support, they planned to call Thomas, counsel to the fempoueh manufacturer, and question her about the two conference calls.
The government was concerned that Thomas’ testimony could create a potential conflict of interest for Pergler’s attorneys. Specifically, the government theorized that Pergler relied on Thomas’ advice of counsel. The government feared that if the defense elicited Thomas’ testimony about the conference calls, it would thereby waive Pergler’s attorney-client privilege with DeMuro. If the government then called DeMuro as a witness, the defense attorneys would be in a conflict of interest position when they cross examined DeMu-ro.
The day before trial, the government filed a memorandum raising these attorney-client privilege and conflict of interest issues. The government sought to determine whether Thomas’ testimony about the two conference calls would destroy Pergler’s attorney-client privilege with De-Muro. The district court ruled that Thomas’ proposed testimony would not waive Pergler’s attorney-client privilege with De-Muro because the calls were not confidential, and thus were not subject to the privilege.
After the court’s ruling, the government asked that Pergler waive his potential advice-of-counsel defense. Attorney Gou-raige indicated to the court that he had counseled Pergler about the waiver and that Pergler waived his advice-of-counsel defense. The court engaged in a colloquy with Pergler during which it briefly explained . the potential conflict of interest and confirmed that Pergler indeed wanted to waive his advice-of-counsel defense.
The government then requested that the court appoint independent counsel to advise Pergler of his rights. Again, in a brief colloquy with the court, Pergler indicated that he was aware of his right to discuss the waiver with independent counsel. Pergler, however, declined the court’s offer to allow him time to consult with another attorney.
At trial, Pergler’s counsel called only one witness on Pergler’s behalf, the fem-pouch manufacturer. The defense did not call Thomas or DeMuro. Pergler alleges that his attorneys’ failure to call these witnesses stemmed from their conflict of interest. Further, Pergler argues that the conflict of interest forced the defense to truncate its cross-examination of Nicholson.
Pergler, with new counsel, filed a direct appeal claiming that his Latham & Watkins defense team denied him effective assistance of counsel as a direct result of their conflict of interest. Pergler chose not to use 28 U.S.C. § 2255 to bring his ineffective assistance of counsel claim; therefore, we do not have the benefit of a developed factual record.
II. Discussion
Pergler argues that the district court violated his Sixth Amendment right to effective assistance of counsel because it allowed Gouraige and Leib to defend him despite an actual or potential conflict of interest. The defendant bears the burden [1009]*1009of proof for an ineffective assistance of counsel claim because we adopt a strong presumption that counsel was effective. See United States v. Herrera-Rivera, 25 F.3d 491, 495 (7th Cir.1994) (citing Strickland v. Washington, 466 U.S. 668, 690, 104 S.Ct. 2052, 80 L.Ed.2d 674 (1984)).
To prevail, Pergler must prove that (1) his counsel’s performance was deficient and (2) the failure to provide adequate representation prejudiced his defense. See Cabello v. United States, 188 F.3d 871, 875 (citing Strickland, 466 U.S. at 687, 104 S.Ct. 2052). However, when, as here, the claim is based on a conflict of interest, the defendant can satisfy the prejudice element by proving either that his counsel (1) labored under an actual conflict of interest, see Strickland, 466 U.S. at 692, 104 S.Ct. 2052, or (2) was subject to a potential conflict of interest which the court was or should have been aware of, and which it failed to address adequately, see United States v. Fish, 34 F.3d 488, 492 (7th Cir.1994) (citing Holloway v. Arkansas, 435 U.S. 475, 484-91, 98 S.Ct. 1173, 55 L.Ed.2d 426 (1978)). We review ineffective assistance of counsel claims de novo. See Cabello, 188 F.3d at 875 (citing Spreitzer v. Peters, 114 F.3d 1435, 1450 (7th Cir.1997)).
A. Conflict of Interest
We are generally reluctant to hear ineffective assistance of counsel claims on direct appeal because most trial records, unsupplemented by a 28 U.S.C. § 2255 hearing, lack the evidence necessary to fashion a successful claim. See Fish, 34 F.3d at 491 n .1. In his arguments, Pergler implies that a conflict of interest existed because he received advice from a Latham & Watkins attorney while he was perpetrating Medicare fraud, and hired other Latham & Watkins counsel to defend him from the fraud charges. The fact that both sets of attorneys work for the same firm is not conclusive. When reviewing ineffective assistance of counsel claims, we presume that the attorneys made reasonable judgments and decline to second guess strategic choices. See United States v. Shukri, 207 F.3d 412, 418 (7th Cir.2000). Pergler simply fails to provide enough proof of a conflict to overcome our presumption.
1) Actual Conflict of Interest
Pergler claims that his defense team labored under an actual conflict of interest. An actual conflict of interest exists when “the defense attorney was required to make a choice advancing his own interests to the detriment of his client’s interests.” United States v. Horton, 845 F.2d 1414, 1419 (7th Cir.1988) (citations omitted). Pergler contends that the government admitted an actual conflict of interest when it brought the issue of Thomas’ proposed testimony to the attention of the district court. It is clear from the record that the government admitted no such actual conflict. The government merely argued that a conflict of interest problem could arise if Thomas’ testimony abrogated Pergler’s attorney-client privilege with DeMuro and if DeMuro were subject to cross-examination by Pergler’s defense team. (Gov’t Mem. Concerning Waiver of Attorney-Client Privilege, 1-2).
Further, Pergler failed to show that an actual conflict existed. The district court’s response to the government’s memorandum precluded an actual conflict in this case. The court ruled that the conference calls, the subject of Thomas’ proposed testimony, were not covered by the attorney-client privilege. Therefore, testimony about them would not waive Pergler’s attorney-client privilege with DeMuro, and Pergler’s defense team could freely question Thomas about the conference calls without creating any conflict of interest. This evidentiary ruling eliminated the possibility that an actual conflict existed regarding Thomas’ proposed testimony.
2) Potential Conflict of Interest
Pergler briefly argues that Thomas’ proposed testimony caused a po[1010]*1010tential conflict of interest. The defendant’s burden of proof for potential conflict of interest claims differs depending on whether the conflict of interest was brought to the judge’s attention. If an attorney brought the potential conflict of interest to the attention of the court, or the court knew or reasonably should have known about the conflict, we will assume prejudice when the judge fails to address the conflict adequately. See Cabello, 188 F.3d at 875 (citing Holloway, 435 U.S. 475, 484-91, 98 S.Ct. 1173, 55 L.Ed.2d 426 (1978); Fish, 34 F.3d at 492). If the trial judge did not have notice of the potential conflict, the defense must prove that his counsel actively represented conflicting interests and that it prejudiced his case. See id. (citing Cuyler, 446 U.S. 335, 350, 100 S.Ct. 1708, 64 L.Ed.2d 333 (1979); Fish, 34 F.3d at 492).
In this case, the judge had notice of the potential conflict of interest addressed in the government’s memorandum: that Thomas’ proposed testimony about the conference calls could lead to a conflict of interest situation. We believe that the district court adequately addressed the potential conflict created by Thomas’ proposed testimony. As explained above, the judge’s evidentiary ruling alleviated the potential conflict. Further, the judge investigated and learned that Pergler’s attorneys did not plan to call DeMuro to the stand. Given this information, the district court rightly concluded that the risk of potential conflict had been nullified, and allowed the proceeding to continue. Per-gler has not shown that an actual or mishandled potential conflict of interest existed.
B. Deficient Performance and Prejudice
Pergler next argues that three of his defense team’s decisions show deficient lawyering and prejudiced his defense: (1) deciding not to call DeMuro to provide an advice-of-counsel defense or general testimony; (2) choosing not to call Thomas as a witness; and (3) conducting a brief cross-examination of Nicholson. When evaluating an attorney’s performance, we presume that her conduct “falls within the wide range of reasonable professional assistance; that is, the defendant must overcome the presumption that, under the circumstances, the challenged action ‘might be considered sound trial strategy.’ ” Foster v. Schomig, 223 F.3d 626, 631 (7th Cir.2000) (quoting Strickland, 466 U.S. at 689, 104 S.Ct. 2052); see Horton, 845 F.2d at 1419 (citations omitted). Pergler fails to overcome the presumption. He does not provide any evidence from the record showing that Gouraige and Leib failed to pursue a legitimate trial strategy by declining to call Thomas and DeMuro as witnesses. Gouraige and Leib may have concluded that Thomas’ and DeMuro’s testimony would hurt Pergler. These two potential witnesses may have testified that Pergler ignored their advice, declined to resolve the billing issues before submitting claims to Medicare or knowingly defrauded Medicare. Pergler fails to overcome our presumption that his trial counsel followed a sound strategy.
As to the cross-examination of Medicare expert Nicholson, Pergler argues that an exchange between his trial counsel and the court proves that his attorneys tailored their representation to respond to a conflict of interest and that their actions hurt Pergler’s defense. During the government’s direct examination, Nicholson testified that he believed that DeMuro took his advice more seriously than Pergler and the other conference call participants. Pergler’s counsel asked the court to strike this part of Nicholson’s testimony. They argued that their cross-examination of Nicholson on this point might require them to call DeMuro to testify about the conference call. The court refused to strike the testimony. Pergler’s counsel concluded Nicholson’s cross-examination without asking about the basis behind Nicholson’s perception.
[1011]*1011It is not at all clear that the defense team’s decision to truncate cross-examination constituted deficient representation caused by a conflict. First, it is unclear that Nicholson’s cross-examination would require the defense to call DeMuro at all. There were three other participants in the conference call besides DeMuro and Nicholson, any of whom could have testified. Second, it is not clear how the claimed conflict of interest would have come into play since the defense team would be questioning Pergler on direct examination. Further, Pergler’s attorneys declined the court’s offers to require more of Nicholson. The court offered to strike Nicholson’s testimony if Nicholson had no concrete basis for his opinion. It also offered to have the government further explore the basis for Nicholson’s opinion. The defense took advantage of neither option.
It is not clear from the record why Pergler’s trial counsel opted not to question Nicholson about the basis for his opinion. It is clear, however, that Pergler’s counsel had several options for proceeding that would not cause a conflict of interest. We will not guess at defense counsel’s reasons for structuring Nicholson’s cross-examination as they did.1 The evidence that Pergler marshals is not strong enough to overcome our presumption that his counsel acted adequately.
Even if we assume Gouraige and Leib acted deficiently, Pergler fails to show that their decision not to call DeMuro and Thomas and to cut short Nicholson’s cross-examination prejudiced his case. To demonstrate prejudice, Pergler must show that “there is a reasonable probability that, but for counsel’s unprofessional errors, the result of the proceeding would have been different.” Strickland, 466 U.S. at 694, 104 S.Ct. 2052. It is insufficient for Pergler to show merely that “the errors had some conceivable ef-feet on the outcome of the proceeding.” Id. at 693, 104 S.Ct. 2052. Pergler does not offer any evidence that Thomas or DeMuro would have provided exculpatory information or that Nicholson’s testimony was key to his conviction. Pergler fails to demonstrate that his attorneys’ three decisions changed the outcome of his case.
III. Conclusion
In the absence of a 28 U.S.C. § 2255 record it is not our function to engage in speculation. We AffiRm the district court’s decision.