PER CURIAM:

Rommie Dale Thompson seeks relief from the 180-month sentence imposed by the district court after he pled guilty to bank robbery, 18 U.S.C.A. § 2113(a) (West 2000). In calculating his sentencing range, the district court found, inter alia, that Thompson was a career offender under U.S. Sentencing Guidelines Manual § 4B1.1 (2004). Thompson’s applicable Guideline range was 151 to 188 months of imprisonment, and treating the Guidelines as mandatory, the district court sentenced Thompson to a 180-month term of imprisonment. Thompson does not challenge his conviction.

At his sentencing hearing, Thompson objected to the procedures utilized by the court, arguing that they violated the Sixth Amendment principles outlined in Blakely v. Washington, 542 U.S. 296, 124 S.Ct. 2531, 159 L.Ed.2d 403 (2004). Citing United States v. Booker, 543 U.S. 220, 125 S.Ct. 738, 160 L.Ed.2d 621 (2005), on appeal, Thompson asserts that his sentence is unconstitutional. Thompson asserts that his sentence violates Booker because the district court (1) sentenced him under a mandatory sentencing guidelines scheme and (2) violated his Sixth Amendment right by sentencing him as a career offender. For the reasons set forth below, we vacate and remand for resentencing. 1

In United States v. White, 405 F.3d 208 (4th Cir. 2005), we held that treating the Guidelines as mandatory constitutes error under Booker. See id. at 216-17. Moreover, because Thompson’s Blakely objection sufficed to preserve his statutory Booker claim, we must review his claim of statutory Booker error for harmless error. See United States v. Rodriguez, 433 F.3d 411, 415 (4th Cir. 2006) (holding that because the appellant had “properly preserved his claim of statutory Booker error *206 by raising a timely Blakely objection at sentencing,” the Court was “obliged to review his preserved claim of statutory Booker error for harmless error”). Accordingly, we must reverse unless the Government demonstrates that the error is harmless. See Fed.R.Crim.P. 52(a) (“Any error ... that does not affect substantial rights must be disregarded.”). Our review of the record as a whole leads us to conclude that the Government has not met its burden of demonstrating that the error in sentencing Thompson under a mandatory Guidelines scheme does not affect his substantial rights. See Rodriguez, 433 F.3d at 416, (noting that the sentencing court’s silence must be interpreted in the appellant’s favor when the burden rests on the Government). Thus, the error is not harmless.

Accordingly, we vacate Thompson’s sentence and remand for further proceedings. 2 We dispense with oral argument because the facts and legal contentions are adequately presented in the materials before the court and argument would not aid the decisional process.

VACATED AND REMANDED.