Juanita Valerio appeals the 135-month sentence imposed after she pled guilty, without a written plea agreement, to conspiracy to distribute 500 grams or more of cocaine, in violation of 21 U.S.C. § 841(a)(1) (2000). Citing Blakely v. Washington, 542 U.S. 296, 124 S.Ct. 2531, *188159 L.Ed.2d 403 (2004), Valerio asserts on appeal that her sentence violates the Sixth Amendment but does not challenge the validity of her conviction. We affirm Valerio’s conviction, vacate Valerio’s sentence, and remand for resentencing.

Valerio contends that her sentence is unconstitutional in light of Blakely.1 Because Valerio did not raise this issue in the district court, we review for plain error. See United States v. Hughes, 401 F.3d 540, 547 (4th Cir. 2005). To demonstrate plain error, Valerio must establish that error occurred, that it was plain, and that it affected her substantial rights. Id. at 547-48. If a defendant satisfies these requirements, this court’s “discretion is appropriately exercised only when failure to do so would result in a miscarriage of justice, such as when the defendant is actually innocent or the error seriously affects the fairness, integrity or public reputation of judicial proceedings.” Id. at 555 (internal quotation marks and citation omitted).

In United States v. Booker, — U.S. —, 125 S.Ct. 738, 160 L.Ed.2d 621 (2005), the Supreme Court applied the rationale in Blakely to the federal sentencing guidelines and held that the mandatory manner in which the guidelines required courts to impose sentencing enhancements based on facts found by the court by a preponderance of the evidence violated the Sixth Amendment. Id. at 746, 750 (Stevens, J., opinion of the Court). The Court remedied the constitutional violation by making the Guidelines advisory through the removal of two statutory provisions that had rendered them mandatory. Id. at 746 (Stevens, J., opinion of the Court); id. at 756-67 (Breyer, J., opinion of the Court).

Here, the district court sentenced Valerio under the mandatory federal sentencing guidelines and applied enhancements based on facts found by a preponderance of the evidence. Specifically, the court attributed to Valerio at least 3.5 kilograms but less than five kilograms of cocaine and established a base offense level of thirty. See U.S. Sentencing Guidelines Manual (“USSG”) § 2D 1.1 (c)(5) (2003). The court also imposed a three-level enhancement based upon Valerio’s managerial role in the conspiracy, see USSG § 3B1.1(b), a two-level enhancement for obstruction of justice, see USSG § 3C1.1, and a two-level downward adjustment for acceptance of responsibility, see USSG § 3E1.1. These findings yielded a total offense level of thirty-three. With a criminal history category of I, the applicable guideline range was 135 to 168 months of imprisonment, and the court sentenced Valerio to the bottom of the guideline range.

Using only the amount of drugs charged in the indictment and without the enhancements for role in the offense and obstruction of justice, Valerio’s offense level, for purposes of determining whether a Sixth Amendment violation occurred, would have been twenty-six. See USSG § 2D1.1(c)(7); United States v. Evans, 416 F.3d 298, 300 n. 4 (4th Cir. 2005). The resulting guideline range would be sixty-three to seventy-eight months of imprisonment. USSG Ch. 5, Pt. A (Sentencing Table). In light of *189Booker and Hughes, we find that the district court plainly erred in sentencing Valerio and that the error warrants correction.2

Accordingly, we affirm Valerio’s conviction, vacate Valerio’s sentence, and remand for resentencing.3 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.

AFFIRMED IN PART, VACATED IN PART, AND REMANDED