Willie Chester, federal prisoner # 56341-080, appeals the district court’s dismissal of a 28 U.S.C. § 2241 petition challenging his enhanced sentence as an armed career criminal. The district court dismissed the petition for lack of jurisdiction because it determined that Chester’s claims sounded as an unauthorized second or successive 28 U.S.C. § 2255 motion and that Chester had not made the showing necessary to seek § 2241 relief by means of the savings clause of § 2255. Because Chester does not challenge this determination by the district court, he has waived the only issue relevant to his appeal. Yohey v. Collins, 985 F.2d 222, 225 (5th Cir. 1993).

AFFIRMED.