Esteban Ibarra, Jr., appeals the sentence imposed following his guilty plea to conspiracy to possess with intent to distribute marijuana. Ibarra argues that the district court clearly erred in determining the drug quantity for which he was responsible because that quantity was based on the uncorroborated statements of himself and his co-conspirators and, hence, was unreliable.

*359 Ibarra’s post-arrest statements to law enforcement were detailed, were not “bal[d][or] conclusionary,” and were deemed credible by the district court. See United States v. Narviz-Guerra, 148 F.3d 530, 537 (5th Cir. 1998) (internal quotation marks and citation omitted). The district court found that at least one marijuana load described by Ibarra had been corroborated by a co-conspirator that the court had previously sentenced and, additionally, that Ibarra’s post-arrest statements corroborated the statements his co-conspirators gave to law enforcement. Ibarra produced no evidence in rebuttal that the information he disclosed to law enforcement was “materially untrue, inaccurate or unreliable,” United States v. Taylor, 277 F.3d 721, 724 (5th Cir. 2001), and his objection to the drug quantity calculation was alone insufficient to serve as competent rebuttal evidence. See United States v. Lowder, 148 F.3d 548, 553 (5th Cir. 1998). In the absence of rebuttal evidence from Ibarra, the district court did not clearly err in relying on the presentence report in calculating the amount of marijuana involved. See United States v. Gracia, 983 F.2d 625, 629-30 & n. 20 (5th Cir. 1993).

AFFIRMED.