George Paul Skinner appeals the district court’s * order denying Skinner’s 28 U.S.C. § 2255 motion. The district court granted a certificate of appealability (COA) on whether United States v. Booker, 543 U.S. 220, 125 S.Ct. 738, 160 L.Ed.2d 621 (2005), is retroactively applicable on collateral review, and we have since held it is not. See Never Misses A Shot v. United States, 413 F.3d 781, 783-84 (8th Cir. 2005) (per curiam). Skinner also challenges the denial of his claim of ineffective assistance of counsel, upon which *554 the court also granted a COA, and we agree with the district court Skinner made no showing he suffered prejudice as a result of counsel’s deficient performance. See Brown, v. United States, 311 F.3d 875, 878 (8th Cir. 2002) (counsel’s decision not to raise issue unsupported by then-existing precedent did not constitute ineffective assistance), cert. denied, 540 U.S. 891, 124 S.Ct. 229, 157 L.Ed.2d 165 (2003); Nguyen v. United States, 114 F.3d 699, 703-04 (8th Cir. 1997) (ineffective-assistance claim in guilty plea context).

We affirm the judgment of the district court. See 8th Cir. R. 47B.