Daniel Mei appeals from his guilty-plea conviction for conducting a monetary transaction with criminally derived property. He argues on appeal that the district court erred by increasing his sentence by three offense levels pursuant to U.S.S.G. § 3Bl.l(b). However, as noted by the Government, Mei’s instant argument is barred by the appeal-waiver provision contained in his written plea agreement.

Although the Government asserted the appeal waiver in its brief, defense counsel did not file a reply brief. He has therefore failed to address the threshold issue before this court. However, as the record shows that Mei’s waiver of his right to appeal was knowing and voluntary, that waiver should be enforced as valid. See United States v. Melancon, 972 F.2d 566, 567-68 (5th Cir. 1992). Accordingly, Mei’s instant appeal is DISMISSED.