Roberto Fernando Rendon appeals his sentence following his guilty-plea eonvic *436 tion for possession of more than five kilograms of cocaine with intent to distribute. He argues that the district court erred by increasing his sentence on the basis of facts neither admitted by him nor found by a jury beyond a reasonable doubt. Because the district court was not operating under a mandatory guidelines regime when it sentenced Rendon, the district court was authorized to find pertinent sentencing facts. United States v. Mares, 402 F.3d 511, 516-20 (5th Cir.), cert. denied, - U.S. -, 126 S.Ct. 43, 163 L.Ed.2d 76 (2005). Rendon also contends that the district court wrongly considered the Sentencing Guidelines as mandatory despite the decision in United States v. Booker, 543 U.S. 220, 125 S.Ct. 738, 160 L.Ed.2d 621 (2005). This assertion is unsupported by the record. Consequently, the judgment of the district court is AFFIRMED.