COX, Circuit Judge:

The principal issue we address in this appeal is this: By what standard do we review a district court's unobjected-to constructive amendment of a defendant's indictment? We hold that we apply plain-error review. Having concluded that the district court constructively amended Count 2 of Kenneth Lamar Madden's superseding indictment and that the amendment satisfies the plain-error standard, we reverse Madden's conviction on Count 2 and remand.

I. FACTS & PROCEDURAL HISTORY

In December 2010, Madden was arrested after participating in a scheme to rob a drug stash house. A federal grand jury returned a superseding indictment charging him with three counts. Count 1 charged that Madden conspired with others to possess with the intent to distribute cocaine in violation of 21 U.S.C. § 841(a)(1) and (b)(1)(A)(ii). (R.1-57 at 1.) Count 2 charged:

(Id. at 2.) Count 3 charged that he possessed with the intent to distribute cocaine in violation of 21 U.S.C. § 841(a)(1) and (b)(1)(C) and 18 U.S.C. § 2. (Id.)

The case proceeded to trial. The jury returned a verdict of guilty on Counts 1 and 2 and on the lesser-included offense of possession of cocaine on Count 3. (R.1-108.) The district court sentenced Madden to life imprisonment on Count 1, a consecutive sixty months on Count 2, and ninety days concurrent on Count 3. (R.1-126.) Madden appeals.

The district court's instructions to the jury on Count 2 were somewhat confusing. Initially, the court correctly described the charge in Count 2 and used language that mirrored the superseding indictment. The court said that Count 2 charges "that the defendant knowingly used and carried a firearm during and in relation to a crime of violence ... and did knowingly possess a firearm in furtherance of a drug trafficking offense." (R.7-151 at 72). A few moments later, however, the court used different language and charged the jury on Count 2 as follows:

(Id. at 78-79.)1 After the court instructed the jury, the court asked Madden's attorney if she objected to the instructions, and she replied that she did not. (Id. at 91-92.)

II. ISSUES ON APPEAL

We address two issues: first, whether the district court's jury instructions constructively amended Count 2 of the superseding indictment, and second, if the court did constructively amend the indictment, whether the error is reversible error.

Madden also presents four other issues on appeal. He contends that (1) a fatal variance occurred on the Count 1 charge, (2) the Government presented insufficient evidence to prove that he conspired to possess with the intent to distribute as charged in Count 1, (3) he was denied a fair trial, and (4) his life sentence is cruel and unusual punishment. We have carefully considered these contentions and find them without merit. As a result, we address only the issues related to Madden's contention that the district court constructively amended Count 2.

III. DISCUSSION

Madden contends that the district court's jury instructions constructively amended Count 2 of the superseding indictment in violation of the Fifth Amendment. To resolve this issue, we decide (A) whether the district court's instructions constructively amended Count 2 of the superseding indictment and (B) if so, whether the court committed reversible error in doing so.

A.

The Fifth Amendment provides that "[n]o person shall be held to answer for a capital, or otherwise infamous crime, unless on a presentment or indictment of a Grand Jury." U.S. Const. amend. V. Under Supreme Court case law interpreting the Fifth Amendment, "a court cannot permit a defendant to be tried on charges that are not made in the indictment against him." Stirone v. United States, 361 U.S. 212, 217, 80 S.Ct. 270, 273, 4 L.Ed.2d 252 (1960). Simply put, a defendant can be convicted only of a crime charged in the indictment. United States v. Dortch, 696 F.3d 1104, 1111 (11th Cir.2012), cert. denied, ___ U.S. ___, 133 S.Ct. 993, 184 L.Ed.2d 771 (2013).

The district court may not constructively amend the indictment. Stirone, 361 U.S. at 215-16, 80 S.Ct. at 272. A constructive amendment "occurs when the essential elements of the offense contained in the indictment are altered to broaden the possible bases for conviction beyond what is contained in the indictment." United States v. Keller, 916 F.2d 628, 634 (11th Cir.1990).

Count 2 of the superseding indictment reads:

(R.1-57 (emphasis added).) So, under Count 2 as charged in the superseding indictment, a jury could convict Madden if the jury found that he (1) knowingly used and carried a firearm during and in relation to a crime of violence or (2) knowingly possessed a firearm in furtherance of a drug trafficking crime.2 However, the court instructed the jury:

(R. 7-151 at 78 (emphasis added).)

The district court's instructions constructively amended Count 2. The instructions allowed a conviction for "carry[ing] a firearm during and in relation to a drug trafficking offense," when the indictment only charged Madden with possessing a firearm "in furtherance of ... a drug trafficking crime" and using and carrying a firearm "during and in relation to a crime of violence."3

Adding "during and in relation to" broadened the possible bases for conviction beyond what was specified in the superseding indictment. As the Government concedes, (Appellee's Br. at 25-26, 32,) "in furtherance of" is narrower than "during and in relation to." See United States v. Timmons, 283 F.3d 1246, 1251-53 (11th Cir.2002) (explaining the concepts of "in furtherance of" and "during and in relation to"); United States v. Ceballos-Torres, 218 F.3d 409, 413 (5th Cir.2000) ("There are situations where a possession would be `during and in relation to' drug trafficking without `furthering or advancing' that activity."). This change broadened the possible bases for conviction beyond what is contained in the indictment, and as a result, the district court constructively amended the indictment.

B.

Because the district court constructively amended the superseding indictment, we must decide whether the court's constructive amendment is reversible error. To answer this question, we need to (1) decide what standard of review applies and (2) apply that standard to this case.

1.

Madden neither objected to the district court's jury instructions nor raised the constructive-amendment issue before the district court. Ordinarily we review issues not raised before the district court for plain error. See Fed.R.Crim.P. 52(b). But Madden contends that a constructive amendment is a constitutional error that is per se reversible error, and therefore, he does not have to satisfy the plain-error standard. So, the issue before us is whether we review an unobjected-to constructive amendment for plain error or whether such an amendment always requires reversal.

There are conflicts in our case law on this issue. Compare Dortch, 696 F.3d at 1112 (applying plain-error review), with United States v. Peel, 837 F.2d 975, 979 (11th Cir.1988) (concluding that a constructive amendment is a per se reversible error). When we have conflicting case law, we follow our oldest precedent. See United States v. Levy, 379 F.3d 1241, 1245 (11th Cir.2004) ("[W]here there is conflicting prior panel precedent, we follow the first in time.").

Our oldest prior precedent appears to be United States v. Carroll, 582 F.2d 942 (5th Cir.1978).4 In Carroll, the district court, while instructing the jury, deviated from the language of the indictment and included an offense that was not charged in the indictment. Id. at 943-44. The jury convicted him. Id. at 943. On appeal, the defendant argued that the court's incorrect instruction constructively amended the indictment in violation of the Fifth Amendment. Id.

The former Fifth Circuit noted that the defendant did not object to the improper instruction and reviewed the alleged error under a plain-error standard. Id. at 943-44. The court determined — and the government conceded — that the improper instruction was erroneous. Id. at 944. But the government argued that the error did not affect the defendant's substantial rights because "there was no fundamental unfairness which would warrant ... setting the conviction aside." Id. The court rejected this argument, concluding that "there are some constitutional rights so basic to a fair trial that their infraction can never be treated as harmless" and that "[t]he right of a defendant to be tried under an indictment presented solely by a grand jury is one such right." Id. at 944 (quoting Chapman v. California, 386 U.S. 18, 23, 87 S.Ct. 824, 827-28, 17 L.Ed.2d 705 (1967)) (emphasis added). For that reason, the court reversed the defendant's conviction.

At first glance Carroll looks as if it governs this case. But "our prior precedent is no longer binding once it has been substantially undermined or overruled by... Supreme Court jurisprudence." United States v. Gallo, 195 F.3d 1278, 1284 (11th Cir.1999). And Carroll was decided long before the Supreme Court's opinion in United States v. Olano, 507 U.S. 725, 113 S.Ct. 1770, 123 L.Ed.2d 508 (1993), addressing plain-error review. For the reasons that follow, we conclude that Olano has overruled — or at the very least, substantially undermined — Carroll to the extent that Carroll always requires reversal when a constructive amendment occurs.

Olano "clarif[ied] the standard for `plain error' review," id. at 731, 113 S.Ct. at 1776, held that forfeited errors are subject to plain-error review, id. at 731, 113 S.Ct. at 1776, and outlined a test to determine if a district court had committed plain error, id. at 732-37, 113 S.Ct. at 1776-79. The plain-error test has four prongs: there must be (1) an error (2) that is plain and (3) that has affected the defendant's substantial rights; and if the first three prongs are met, then a court may exercise its discretion to correct the error if (4) the error "seriously affect[s] the fairness, integrity or public reputation of judicial proceedings." Id. at 732, 113 S.Ct. at 1776 (alteration in original) (quoting United States v. Young, 470 U.S. 1, 15, 105 S.Ct. 1038, 1046, 84 L.Ed.2d 1 (1985)). Importantly, "a court of appeals may correct the error ... only if it meets these criteria." Id. at 732, 113 S.Ct. at 1777 (first emphasis added).

We have read Carroll as establishing that a constructive amendment always requires reversal regardless of whether the defendant objected to the amendment. See, e.g., Peel, 837 F.2d at 979 (concluding that "[t]here can be no doubt that pursuant to Carroll the rule in the Eleventh Circuit is that a jury instruction which results in the constructive amendment of a grand jury indictment is reversible error per se" even if a defendant fails to object). In other words, under this reading of Carroll, if we conclude that the district court constructively amended the indictment, we must reverse the conviction.

But to the extent that Carroll holds that an unobjected-to constructive amendment always requires reversal, Olano has abrogated that holding. Olano teaches that our authority to correct a forfeited error is always discretionary. 507 U.S. at 732, 113 S.Ct. at 1776 ("Rule 52(b) leaves the decision to correct the forfeited error within the sound discretion of the court of appeals...."); id. at 735, 113 S.Ct. at 1778 ("Rule 52(b) is permissive, not mandatory."). Even if we conclude that the plain-error test is satisfied, we may correct the error, but we are not required to do so. Id. at 735, 113 S.Ct. at 1778; see also United States v. Duncan, 400 F.3d 1297, 1301 (11th Cir.2005) ("We have discretion to correct an error under the plain error standard....").

Thus, Olano's holding that a court of appeals always has the discretion to correct a forfeited error clashes with Carroll's holding that we must always reverse when there is an unobjected-to constructive amendment. As a result, we conclude that Carroll has been undermined to the point of abrogation by Olano, and we are no longer bound by Carroll. See United States v. Archer, 531 F.3d 1347, 1352 (11th Cir.2008) (noting that we are bound by the rule of our prior precedent "unless and until it is overruled or undermined to the point of abrogation by the Supreme Court").

And the Fifth Circuit has reached the same conclusion — Olano abrogated its precedent requiring reversal when a district court constructively amends an indictment. See United States v. Fletcher, 121 F.3d 187, 193 (5th Cir.1997) ("Following Olano, this circuit ... concluded that we have discretion to correct a [constructive amendment] — an error that, prior to Olano, would have required reversal per se.").

Because Carroll no longer binds us, we must decide what standard of review applies in this case. We look to Olano to answer this question. Olano tells us that we review a forfeited error for plain error. 507 U.S. at 732, 113 S.Ct. at 1776. And we can only correct that error if all four prongs of the plain-error test are met. Id. at 732, 113 S.Ct. at 1777 ("[A] court of appeals may correct the error ... only if it meets these criteria." (second emphasis added)). To that end, we hold that we may only reverse a defendant's conviction based on an unobjected-to constructive amendment if the constructive amendment satisfies the Olano plain-error standard. That is, the amendment must (1) be an error (2) that is plain (3) that affects the defendant's substantial rights and (4) that seriously affects the fairness, integrity, or public reputation of judicial proceedings. Id. at 732, 113 S.Ct. at 1777.

At least five of our sister circuits follow this approach: they do not require reversal when a defendant fails to object to the district court's constructive amendment of an indictment, but instead, they apply Olano plain-error review. See United States v. Bohuchot, 625 F.3d 892, 897 (5th Cir. 2010); United States v. Gavin, 583 F.3d 542, 545-46 (8th Cir.2009); United States v. Brandao, 539 F.3d 44, 57 (1st Cir.2008); United States v. Brown, 400 F.3d 1242, 1253-54 (10th Cir.2005); United States v. Remsza, 77 F.3d 1039, 1043 (7th Cir.1996).

Moreover, applying Olano's plain-error review to unpreserved constructive amendment challenges is not novel in this circuit; in fact, it comports (for the most part) with our post-Olano case law on this issue. See Dortch, 696 F.3d at 1112 (reviewing an unobjected-to constructive amendment for plain error); United States v. Starke, 62 F.3d 1374, 1380-81 (11th Cir.1995) (same); United States v. Flynt, 15 F.3d 1002, 1006 (11th Cir.1994) (same).5

The only outlying case in our post-Olano case law is United States v. Williams, 527 F.3d 1235 (11th Cir.2008). In Williams, the defendant failed to object to the district court's instructions that she argued on appeal constructively amended her indictment. Id. at 1245-46 & n. 8. Discussing the standard of review, we said in a footnote:

Id. at 1246 n. 8 (alterations in original) (citation omitted) (internal quotation marks omitted). The footnote does not clearly identify "the standard set forth in Stirone," but insofar as that standard is that an unobjected-to constructive amendment always requires reversal, Olano controls for the reasons we explained above. Moreover, the Williams language quoted above is dicta — the court concluded that the district court did not constructively amend the indictment and therefore did not reach the issue of whether such an amendment was reversible error. Id. at 1247. "And dicta is not binding on anyone for any purpose." Edwards v. Prime, Inc., 602 F.3d 1276, 1298 (11th Cir.2010). Williams, therefore, does not affect our holding.

In sum, we hold that Olano has abrogated Carroll to the extent that Carroll always requires reversal when a district court constructively amends an indictment, even when the defendant fails to object. In cases where the defendant fails to object to a constructive amendment, we apply traditional plain-error review as defined in Olano.

2.

We may reverse a conviction under plain-error review if we find that four prongs are met: there must be (1) an error (2) that is plain and (3) that has affected the defendant's substantial rights; and if the first three prongs are satisfied, we may exercise discretion to correct the error if (4) the error seriously affects the fairness, integrity, or public reputation of judicial proceedings. Olano, 507 U.S. at 732, 113 S.Ct. at 1776.6

First, the district court erred when it constructively amended the indictment in violation of the Fifth Amendment. An error is a "[d]eviation from a legal rule." Id. at 732-33, 113 S.Ct. at 1777. Our case law establishes that constructively amending an indictment is a departure from the legal rule that "a defendant can only be convicted for a crime charged in the indictment." Keller, 916 F.2d at 633.

Second, the error was plain. "For a plain error to have occurred, the error must be one that is obvious and is clear under current law." Dortch, 696 F.3d at 1112 (quoting United States v. Carruth, 528 F.3d 845, 846 n. 1 (11th Cir. 2008)). It is clear that "in furtherance of" and "during and in relation to" are alternative methods of conviction. See Timmons, 283 F.3d at 1251-53. And it is clear under current law that a court errs when it allows for an alternative method of conviction that is not included in the indictment. See United States v. Bizzard, 615 F.2d 1080, 1082 (5th Cir.1980) (noting that because "the defendant was charged by the court with an additional element not presented by the grand jury" and "the jury might have convicted the [defendant] on that extraneous element, the district court's error is clearly reversible" (emphasis added)).

Third, the error affected Madden's substantial rights. A plain error affects the defendant's substantial rights when the error is "prejudicial." Olano, 507 U.S. at 734, 113 S.Ct. at 1778. That is, the error "affected the outcome of the district court proceedings." Id. at 734, 113 S.Ct. at 1778. Here, the error prejudiced Madden. Having considered the evidence received at trial, Count 2 of the indictment, and the court's jury instructions, we conclude that Madden may well have been convicted on a charge not in the indictment. In the end, because we cannot say "with certainty" that with the constructive amendment, Madden was convicted solely on the charge made in the indictment, see Stirone, 361 U.S. at 217, 80 S.Ct. at 273, we hold that the amendment prejudiced him.

Fourth, we find it self-evident in this case that the error seriously affects the fairness, integrity, and public reputation of judicial proceedings. See United States v. Floresca, 38 F.3d 706, 714 (4th Cir.1994) (en banc) ("[C]onvicting a defendant of an unindicted crime affects the fairness, integrity, and public reputation of judicial proceedings in a manner most serious.").

IV. CONCLUSION

Accordingly, we exercise our discretion under plain-error review and reverse Madden's conviction on Count 2. We affirm Madden's other convictions. The case is remanded to the district court for further proceedings consistent with this opinion.

AFFIRMED IN PART, REVERSED IN PART, and REMANDED.