Kevin Duke, federal prisoner # 09210-078, appeals the district court’s denial of his 18 U.S.C. § 3582(c) motion to reduce his concurrent 262-month sentences for possession with intent to distribute cocaine base. Duke questions the propriety of his sentencing as a career offender and argues that § 3582(c) is applicable to his sentences based upon the amendments to the crack cocaine guidelines.

Duke may not use a § 3582(c)(2) motion to challenge the appropriateness of the district court’s application of a career offender enhancement in its calculation of his original sentences. See United States v. Whitebird, 55 F.3d 1007, 1011 (5th Cir. 1995). Moreover, because Duke’s sentences were based on his prior convictions and not on the quantity of crack cocaine, he was not “sentenced to a term of imprisonment based on a sentencing range that has subsequently been lowered by the Sentencing Commission.” See § 3582(c)(2); United States v. Gonzalez-Balderas, 105 F.3d 981, 982 (5th Cir. 1997).

The district court’s judgment is AFFIRMED, the Government’s motion for summary affirmance is GRANTED, and the Government’s motion for an extension of time is DENIED as moot.