Frank James Bracks appeals the sentence imposed following his bench trial conviction for kidnapping, using and carrying a firearm during and relation to a crime of violence, and being a felon in possession of a firearm. He was sentenced to an aggregate of 205 months of imprisonment and five years of supervised release. He argues that, in light of United States v. Booker, — U.S.-, 125 S.Ct. 738, 160 L.Ed.2d 621 (2005), his sentence is invalid because the district court applied the sentencing guidelines as if they were mandatory. Because Bracks did not raise this issue in the district court, we review it only for plain error. United States v. Valenzuela-Quevedo, 407 F.3d 728, 732 (5th Cir. 2005); United States v. Mares, 402 F.3d 511, 513, 520-22 (5th Cir. 2005), petition for cert. filed (Mar. 31, 2005) (No. 04-9517).

Bracks is unable to establish plain error with regard to his Booker claim because he cannot establish that being sentenced under a mandatory sentencing guidelines scheme affected his substantial rights. The record does not indicate that the district court “would have reached a significantly different result” under a sentencing scheme in which the guidelines were advisory only. See Mares, 402 F.3d at 520-22; Valenzuela-Quevedo, 407 F.3d at 733-34.

Bracks’s argument that Mares was wrongly decided is unavailing. Absent en banc reconsideration or a superseding contrary decision of the Supreme Court, one panel may not overrule the decision of a prior panel. United States v. Ruff, 984 F.2d 635, 640 (5th Cir. 1993).

Accordingly, the judgment of the district court is AFFIRMED.