Defendant-Appellant Allan Roberto Rivera-Garcia appeals his guilty-plea conviction and sentence for being found in the United States, without permission, following removal. See 8 U.S.C. § 1326(a),(b). Rivera-Garda asserts that the sentencing provisions in 8 U.S.C. § 1326(b) are unconstitutional on their face and as applied in his case. This constitutional challenge is foreclosed by Almendarez-Torres v. United States, 523 U.S. 224, 235, 118 S.Ct. 1219, 140 L.Ed.2d 350 (1998). Although Rivera-Garcia contends that AlmendarezTorres was incorrectly decided and that a majority of the Supreme Court would overrule Almendarez-Torres in light of Apprendi v. New Jersey, 530 U.S. 466, 120 S.Ct. 2348, 147 L.Ed.2d 435 (2000), we have repeatedly rejected such arguments on the basis that Almendarez-Torres remains binding. See United States v. Garza-Lopez, 410 F.3d 268, 276 (5th Cir.), cert. denied, — U.S. -, 126 S.Ct. 298, *990163 L.Ed.2d 260 (2005). Rivera-Garda candidly concedes that his argument is foreclosed in light of Almendarez-Torres and circuit precedent, raising it here solely to preserve it for further review. We affirm Rivera-Garcia’s conviction.

Rivera-Garda also insists that the district court committed reversible error when it sentenced him pursuant to the mandatory scheme United States Sentencing Guidelines (U.S.S.G.) that was ultimately held unconstitutional in United States v. Booker, 543 U.S. 220, 125 S.Ct. 738, 160 L.Ed.2d 621 (2005). In sentencing Rivera-Garda under a mandatory guidelines regime, the district court committed error that we refer to as Fanfan error. See United States v. Walters, 418 F.3d 461, 463 (5th Cir. 2005). The government concedes that Rivera-Garda preserved his Fanfan claim for appellate review. To prevail, the government must prove that the Fanfan error in this case was harmless beyond a reasonable doubt. The government has not sustained this burden. See id. at 463-64. We are constrained to vacate Rivera-Garcia’s sentence and remand the case for resentencing.

CONVICTION AFFIRMED; SENTENCE VACATED; CASE REMANDED FOR RESENTENCING.