
    UNITED STATES of America, Plaintiff-Appellee, v. Charles Christopher ROUNDTREE, Defendant-Appellant.
    No. 07-12616
    Non-Argument Calendar.
    United States Court of Appeals, Eleventh Circuit.
    Nov. 27, 2007.
    James H. Burke, Jr., Federal Public Defender, R. Fletcher Peacock, Jacksonville, FL, for Defendant-Appellant.
    David Paul Rhodes, United States Attorney’s Office, Tampa, FL, for PlaintiffAppellee.
    Before BIRCH, DUBINA and WILSON, Circuit Judges.
   PER CURIAM:

Charles Christopher Roundtree appeals his 180-month sentence, arguing that the district court’s decision to sentence him as an armed career criminal, without his admitting, or a jury finding, that he had three prior violent felony convictions, was unconstitutional. He concedes that the Supreme Court’s decisions in Apprendi v. New Jersey, 530 U.S. 466, 120 S.Ct. 2348, 147 L.Ed.2d 435 (2000), Blakely v. Washington, 542 U.S. 296, 124 S.Ct. 2531, 159 L.Ed.2d 403 (2004), and United States v. Booker, 543 U.S. 220, 125 S.Ct. 738, 160 L.Ed.2d 621 (2005) except the fact of a prior conviction from the Sixth Amendment requirement that “any fact that increases the penalty for a crime beyond the prescribed statutory maximum must be submitted to a jury, and proved beyond a reasonable doubt.” Apprendi, 530 U.S. at 490, 120 S.Ct. at 2362-63.

Roundtree also concedes that he failed to preserve the issue below. When a defendant fails to preserve an issue below, we review for plain error. United States v. Martinez, 407 F.3d 1170, 1173 (11th Cir.2005).

“The Armed Career Criminal Act (“ACCA”), 18 U.S.C. § 924(e)(1), provides a mandatory minimum sentence of fifteen years for anyone who violates 18 U.S.C. § 922(g) after three convictions for a violent felony or a serious drug offense.” United States v. Greer, 440 F.3d 1267, 1269 (11th Cir.2006). In Almendarez-Torres v. United States, 523 U.S. 224, 118 S.Ct. 1219, 140 L.Ed.2d 350 (1998), the Supreme Court held that a prior conviction is not a fact that must be alleged in the indictment or found by a jury beyond a reasonable doubt. United States v. Shelton, 400 F.3d 1325, 1329 (11th Cir.2005). The Court’s subsequent seminal decisions in Appretidi, Blakely, and Booker have not disturbed the holding of Almendarez-Torres. Id. Although Shepard v. United States, 544 U.S. 13, 125 S.Ct. 1254, 161 L.Ed.2d 205 (2005) “may arguably cast doubt on the future prospects of Almendarez-Torres’s holding regarding prior convictions, the Supreme Court has not explicitly overruled Almendarez-Torres. As a result, we must follow Almendarez-Torres.” United States v. Camacho-Ibarquen, 410 F.3d 1307, 1316 n. 3 (11th Cir.2005) (per curiam).

As Roundtree acknowledges in his brief, his arguments are contrary to our precedent. Thus, the district court did not err, and we affirm.

AFFIRMED. 
      
      . Section 922(g) prohibits possession of a firearm by a convicted felon.
     