Tony Jay Breedlove appeals from his conviction of escape. He argues that the *325 evidence was insufficient to support the district court’s finding that he committed the offense of possession of stolen mail while on escape status. The finding that he committed this offense disqualified him from receiving a four-level downward adjustment to his offense level pursuant to U.S.S.G. § 2P1.1(b)(3), which applies to defendants who escape from halfway houses or similar facilities. Within his sufficiency argument, he also contends that the Government violated Federal Rule of Evidence 404(b) by arguing that his prior stolen mail conviction was relevant to the issue whether he committed a stolen mail offense while on escape status.

Breedlove did not raise his Rule 404(b) argument in the district court; our review therefore is for plain error. See United States v. Williams, 620 F.3d 483, 488-89 (5th Cir. 2010), cert. denied, — U.S. -, 131 S.Ct. 1534, 179 L.Ed.2d 348 (2011). Rule 404(b) does not apply to sentencing proceedings. See Fed.R.Evtd. 1101(d)(3) (stating that the Federal Rules of Evidence do not apply at sentencing). Breedlove cannot show error as to Rule 404(b), plain or otherwise.

We “review[] de novo the district court’s guidelines interpretations and review[] for clear error the district court’s findings of fact.” United States v. Le, 512 F.3d 128, 134 (5th Cir. 2007). The district court makes factual findings at sentencing under the preponderance of the evidence standard. United States v. Mares, 402 F.3d 511, 519 (5th Cir. 2005). The facts as set out in the record were sufficient for the district court to find by a preponderance of the evidence that Breedlove knowingly possessed stolen mail inside a bag that was in his car when he was arrested. On the facts found by the district court, Breedlove committed the federal felony offense of possession of stolen mail while on escape status. See 18 U.S.C. § 1708. The district court did not err by denying Breed-love a downward adjustment pursuant to § 2Pl.l(b)(3).

AFFIRMED.