Byron Donsha Adams appeals his sentence following his guilty-plea conviction for conspiracy to possess with intent to distribute 50 grams or more of cocaine base and possession with intent to distribute 50 grams or more of cocaine base. *594Adams argues that his sentence is unconstitutional in light of United States v. Booker, -U.S.-, 125 S.Ct. 738, 160 L.Ed.2d 621 (2005), because he was sentenced under a mandatory guidelines scheme. We review for plain error. United States v. Mares, 402 F.3d 511, 520 (5th Cir. 2005), petition for cert. filed (Mar. 31, 2005) (No. 04-9517); United States v. Valenzuela-Quevedo, 407 F.3d 728, 732 (5th Cir. 2005), petition for certfiled (July 25, 2005) (No. 05-5556).

The district court committed error that is plain by sentencing Adams under a mandatory sentencing guidelines scheme. Valenzuela-Quevedo, 407 F.3d at 733. However, Adams fails to carry his burden of showing that this error affected his substantial rights. Id. at 733-34. The district court made no comments indicating that it would have imposed a lesser sentence in the absence of mandatory guidelines. Accordingly, the judgment of the district court is AFFIRMED.