OPINION

Orlando Sanchez, a federal prisoner, appeals pro se the order of the United States District Court for the Middle District of Pennsylvania denying his motion for a reduction of sentence filed pursuant to 18 U.S.C. § 3582(c)(2). For the reasons that follow, we will summarily affirm the judgment of the District Court.

In 1993, following a jury trial, Sanchez was convicted in the District Court of conspiracy to distribute cocaine, possession by a felon of a firearm, and using or carrying a firearm in relation to a drug trafficking crime. Sanchez was sentenced to a term of 386 months imprisonment. Sanchez’s conviction and sentence were affirmed on direct appeal by this Court in 1994. The same year, the Supreme Court denied Sanchez’s petition for a writ of certiorari. In May 2001, Sanchez filed a motion pursuant to 28 U.S.C. § 2255 in the District Court, which was denied. This Court declined to issue Sanchez a certificate of appealability. See United States v. Sanchez, C.A. No. 02-1626.

Sanchez, who is incarcerated at the Edgefield Federal Correctional Institution in South Carolina, filed the underlying § 3582(c)(2) motion in the District Court on April 25, 2005. In his motion, Sanchez argued that he was entitled to a sentence reduction because United States v. Booker, — U.S.-, 125 S.Ct. 738, 160 L.Ed.2d 621 (2005), “effectively amended” the Sentencing Guidelines by eliminating their mandatory nature. On May 10, 2005, the District Court denied Sanchez’s motion. This timely appeal followed.

Section 3582(c)(2) provides in relevant part that

in the case of a defendant who has been sentenced to a term of imprisonment based on a sentencing range that has subsequently been lowered by the Sentencing Commission pursuant to 28 U.S.C. § 994(o) ... a court may reduce the term of imprisonment ... if such a *410 reduction is consistent with the applicable policy statements issued by the Sentencing Commission.

18 U.S.C. § 3582(c)(2). Sanchez does not allege an amendment to the Guidelines by the Sentencing Commission. Instead, Sanchez contends that he is entitled to relief under § 3582(c)(2) because his sentence runs afoul of Booker. Contrary to Sanchez’s arguments, however, § 3582(c)(2) permits a reduction of sentence as a result of a subsequent amendment of the Guidelines by the Sentencing Commission, not based on a decision of the Supreme Court that is unrelated to an actual amendment of the Guidelines. Cf. United States v. McBride, 283 F.3d 612 (3d Cir. 2002) (holding that Apprendi v. New Jersey, 530 U.S. 466, 120 S.Ct. 2348, 147 L.Ed.2d 435 (2000), does not afford relief under § 3582(c)(2) because such a claim is “independent of and unrelated to any change in the Guidelines, and [is], therefore, outside the scope of a sentence modification under § 3582(c)(2)”). Sanchez’s reliance on United States v. Marmolejos, 140 F.3d 488 (3d Cir. 1998), is thus misplaced. Marmolejos, decided in the context of a 28 U.S.C. § 2255 proceeding, involved the retroactivity of an amendment to the Guidelines made by the Sentencing Commission.

Sanchez’s challenge to his sentence on the basis of Booker falls within the purview of a motion under § 2255. Because Sanchez has already filed one § 2255 motion, he would need authorization from this Court to file a second or successive § 2255 motion. See 28 U.S.C. § 2244(b)(2). However, we note that we recently concluded that Booker is not retroactively applicable to cases on collateral review. See Lloyd v. United States, 407 F.3d 608 (3d Cir. 2005).

Because this appeal presents “no substantial question,” see 3d Cir. LAR 27.4 and I.O.P. 10.6, we will summarily affirm the District Court’s May 10, 2005, order.