Felicia Roberson appeals from a guilty-plea conviction for possession of cocaine base with intent to distribute and for aiding and abetting in the offense. See 21 U.S.C. § 841(a)(1); 18 U.S.C. § 2.

For the first time on appeal, Roberson argues that the district court erred in im *482 posing a sentence under a mandatory guideline scheme, in violation of United States v. Booker, 543 U.S. 220, 125 S.Ct. 738, 160 L.Ed.2d 621 (2005). We review for plain error. See United States v. Valenzuelar-Quevedo, 407 F.3d 728, 732 (5th Cir.), cert. denied, — U.S.-, 126 S.Ct. 267, 163 L.Ed.2d 240 (2005). Roberson has not shown that the district court would have sentenced her differently under an advisory sentencing scheme. Accordingly, Roberson has failed to show that the district court’s imposition of a sentence under a mandatory guideline scheme was plain error. See id. at 733-34.

AFFIRMED.