Christopher Harvey appeals his 151-month sentence following a guilty plea for distribution of methamphetamine. 21 *474 U.S.C. § 841(a)(1), (b)(1)(C). Harvey argues that the district court enhanced his sentence under U.S.S.G. § 4B1.1 based on his career offender status in violation of United States v. Booker, 543 U.S. 220, 125 S.Ct. 738, 160 L.Ed.2d 621 (2005). We have held, however, that a judge’s determination of career offender status does not implicate Booker, because, except for the defendant’s age, “[cjareer offender status is not ‘a sentencing judge’s determination of a fact other than a prior conviction.” ’ United States v. Guevara, 408 F.3d 252, 261 (5th Cir. 2005), cert. denied, — U.S. -, 126 S.Ct. 1080, 163 L.Ed.2d 898 (2006).

Harvey also raises on appeal the issue of the district court’s mandatory application of the Sentencing Guidelines or so-called “Fanfan” error. Although the Government argues that Harvey has not preserved this issue for appeal, Harvey preserved the issue by raising an objection under Blakely v. Washington, 542 U.S. 296, 124 S.Ct. 2531, 159 L.Ed.2d 403 (2004), in the district court, and, therefore we review the district court’s “Fanfan” error under the harmless error standard of review. See United States v. Rodriguez-Mesa, 443 F.3d 397, 404 (5th Cir. 2006) (a Blakely objection before the district court preserves a Fanfan error for appeal). The Government has not shown beyond a reasonable doubt that the error was harmless. See United States v. Walters, 418 F.3d 461, 463-66 (5th Cir. 2005). Accordingly, Harvey’s sentence is VACATED, and this case is REMANDED for resentencing.