Eric Miller, who is serving a 188-month prison sentence imposed in 2007 after he pleaded guilty to a crack cocaine offense, see United States v. Miller, 256 Fed.Appx. 894, 894-95 (8th Cir. 2007) (per curiam), appeals the district court’s 1 denial of his 18 U.S.C. § 3582(c)(2) motion to reduce his sentence. Miller’s motion was based upon an amendment to the Sentencing Guidelines, which retroactively lowered the base offense level for crack cocaine offenses. The district court denied his motion after a hearing, reasoning in part that the retroactive amendment did not lower the Guide *718 lines sentencing range for Miller because he had been sentenced as a career offender. Upon careful review, we agree with the district court. See United States v. Thomas, 524 F.3d 889, 889-90 (8th Cir. 2008) (per curiam) (although Sentencing Commission lowered offense levels related to crack cocaine quantities, it did not lower the sentencing range for career offenders under U.S.S.G. § 4B1.1). Accordingly, we affirm.