OPINION

Joe Bennett Smith, III, pled guilty to conspiracy to manufacture and distribute marijuana. After his initial appeal, we remanded the case for “re-sentencing and imposition of a sentence of up to 120 months.” On remand, Smith was sentenced to 100-months imprisonment. He now appeals, arguing that his conviction violated the Double Jeopardy Clause and that his sentence was improperly enhanced based on a prior conviction. We dismiss the appeal.

Although Smith sought to raise his double jeopardy claim in a supplemental brief during his first appeal, we found his argument untimely raised and did not consider it. Under the mandate rule, the district court was “bound to carry the mandate of the upper court into execution and could not consider the questions which the mandate laid at rest.” Sprague v. Ticonic Nat’l Bank, 307 U.S. 161, 168, 59 S.Ct. 777, 83 L.Ed. 1184 (1939). “[Wjhere an issue was ripe for review at the time of an initial appeal but was nonetheless foregone, the mandate rule generally prohibits the district court from reopening the issue on remand unless the mandate can reasonably be understood as permitting it to do so.” United States v. Ben Zvi, 242 F.3d 89, 95 (2d Cir. 2001); see also United States v. Aramony, 166 F.3d 655, 662 (4th Cir. 1999) (same). A district court may consider issues foreclosed by the mandate in the following “extraordinary circumstances”: (1) change in controlling legal authority, (2) significant new evidence, or (3) a blatant error resulting in serious injustice. United States v. Bell, 5 F.3d 64, 67 (4th Cir. 1993).

Here, our mandate remanded for resentencing and, thus, impliedly affirmed the conviction. Accordingly, Smith is not entitled to review of this claim unless he can show extraordinary circumstances, which he has failed to do. He makes no effort to show a legal or factual change. While he argues that he is suffering from a serious injustice, the present record does not support his contention. In any event, Smith presents no reason for his failure to timely raise the issue prior to his plea or on his first appeal. Accordingly, because Smith has failed to show “extraordinary circumstances,” the district court properly followed the terms of our mandate and declined to consider Smith’s claim.

Smith next seeks to challenge the statutory enhancement of his sentence based on his prior conviction. However, in his plea agreement, Smith waived his right to appeal his sentence. Although he reserved the right to challenge certain rulings, the enhancement was not one of the claims reserved.

On appeal, Smith does not challenge the validity of his waiver. Instead, he argues that his sentence exceeds the statutory maximum. See United States v. Marin, 961 F.2d 493, 496 (4th Cir. 1992) (permitting appeal of sentence imposed in excess of the statutory maximum, despite general waiver of appeal). Because his indictment did not charge a specific drug quantity, in the absence of a prior conviction, Smith would have faced a five year maximum sentence. See 21 U.S.C. § 841(b)(1)(D) (West Supp. 2002). Thus, he asserts that his 100 month sentence exceeds the maxi *129 mum statutory sentence and permits Mm to raise Ms claim on appeal.

However, Smith signed a plea agreement stating that he had a prior conviction and calculating his maximum exposure based on that prior conviction. The agreement reserved certain issues for appeal, but the propriety of the enhancement was not one of them. Further, the prior conviction and its effect on applicable statutory mimmum sentences were discussed without objection at Smith’s guilty plea hearing. In addition, the Government properly served notice under 21 U.S.C. § 851 (2000), which allowed the district court to sentence Smith to a maximum of ten years under the recidivist portion of § 841(b)(1)(D). *

See United States v. Novey, 922 F.2d 624, 628-29 (10th Cir. 1991) (filing § 851 notice alters statutory maximum). Thus, we find that Smith has waived appeal of this issue.

Based on the foregoing, we dismiss Smith’s appeal. 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.

DISMISSED.