Following his conviction for one charge of possessing between five and 50 grams of cocaine base with intent to distribute, Christopher L. Johnson, prisoner # 07372-043, was sentenced to serve 188 months in prison and a five-year term of supervised release. Johnson filed a motion requesting a nunc pro tunc judgment that is best construed as arising under 28 U.S.C. § 2241 because it raised a claim seeking credit towards Johnson’s federal sentence for time previously spent in state custody. See United States v. Brown, 753 F.2d 455, 456 (5th Cir. 1985). The district court denied Johnson’s motion, and he now moves this court for authorization to proceed in forma pauperis (IFP) on appeal.

Our review of the record and pertinent authority shows that the district court, which sentenced Johnson, lacked jurisdiction over Johnson’s § 2241 petition because this petition should have been filed in the district where he was incarcerated. See Pack v. Yusuff, 218 F.3d 448, 451 (5th Cir. 2000). Consequently, the district court should have dismissed Johnson’s § 2241 petition for want of jurisdiction. Johnson’s motion to proceed IFP on appeal is DENIED, and his appeal is DISMISSED as frivolous. See 5th Cir. R. 42.2.