Rigoberto Camacho-Carranza pleaded guilty to illegally reentering the United States after having been deported following a conviction for a felony, in violation of 8 U.S.C. § 1326(a) and (b)(1). The district court 1 sentenced him to 21 months in prison and 3 years of supervised release.

On appeal, Camacho-Carranza’s counsel has moved to withdraw and has filed a brief under Anders v. California, 386 U.S. 738, 87 S.Ct. 1396, 18 L.Ed.2d 493 (1967). For reversal, counsel suggests that the district court erred in not crediting Camacho-Carranza for time he had served in state and immigration custody. This argument fails. See United States v. Iversen, 90 F.3d 1340, 1344-45 (8th Cir. 1996) (district court does not have authority to credit defendant for time served; such claim should be presented in first instance to Bureau of Prisons). We have also reviewed the record independently for any nonfrivolous issues, see Penson v. Ohio, 488 U.S. 75, 80, 109 S.Ct. 346, 102 L.Ed.2d 300 (1988), and we have found none.

Accordingly, we affirm. We also grant counsel’s motion to withdraw.