Gary Dwight Blair, a federal prisoner, appeals following his guilty plea to a charge of assaulting a correctional officer, in violation of 18 U.S.C. § 111. Blair argues that the district court committed reversible error by imposing a sentence pursuant to the mandatory Federal Sen *368 tencing Guidelines system that was held unconstitutional in United States v. Booker, — U.S. -, 125 S.Ct. 738, 160 L.Ed.2d 621 (2005). We review for plain error. See United States v. Valenzuela-Quevedo, 407 F.3d 728, 732 (5th Cir. 2005), petition for cert. filed (July 25, 2005)(No. 05-5556).

The district court committed error that is plain by sentencing Blair under a mandatory Sentencing Guidelines scheme. See id.; United States v. Mares, 402 F.3d 511, 520-21 (5th Cir. 2005), petition for cert. filed (Mar. 31, 2005)(No. 04-9517). However, Blair has not carried his burden of showing that the district court’s error affected his substantial rights. See Valenzuela-Quevedo, 407 F.3d at 733-34; Mares, 402 F.3d at 521.

Accordingly, the district court’s judgment is AFFIRMED.