Mario Reyes-Sotelo (Reyes) appeals his conviction and 41-month sentence for attempted illegal reentry. See 8 U.S.C. § 1326. Reyes argues that under United States v. Booker, 543 U.S. 220, 125 S.Ct. 738, 160 L.Ed.2d 621 (2005), his sentence must be vacated and his case remanded for resentencing. He asserts that the district court sentenced him pursuant to mandatory Sentencing Guidelines and that the error was not harmless. Reyes asserts, in addition, that § 1326(b) is unconstitutional.

The district court’s sentence pursuant to a mandatory guidelines scheme constitutes Fanfan error. See United States v. Walters, 418 F.3d 461, 463-64 (5th Cir. 2005). The sentencing transcript is silent regarding whether the district court would have imposed the same sentence had the Guidelines been advisory. Thus, the Government has not met its burden of proving beyond a reasonable doubt that the district court would have imposed the same sentence under mandatory Guidelines. See United States v. Zamora-Vallejo, 470 F.3d 592, 595 (5th Cir. 2006)(internal quotations and citation omitted).

Reyes argues that § 1326(b) is unconstitutional. Reyes’s constitutional challenge to § 1326(b) is foreclosed by Almendarez-Torres v. United States, 523 U.S. 224, 235, 118 S.Ct. 1219, 140 L.Ed.2d 350 (1998). See United States v. Garza-Lopez, 410 F.3d 268, 276 (5th Cir.), cert. denied, — U.S.-, 126 S.Ct. 298, 163 L.Ed.2d 260 (2005). Reyes properly concedes that his argument is foreclosed in light of Almendarez-Torres and circuit precedent and raises it here only to preserve it for further review.

Accordingly, we AFFIRM Reyes’s conviction, VACATE his sentence, and REMAND the case for resentencing.