Roberto Toscano challenges the factual basis for his guilty plea to one count of conspiracy to distribute in excess of 1,000 kilograms of marijuana. There is, however, no nonfrivolous issue for appeal with respect to Toscano’s conviction because as part of his written plea agreement, Tosca-no validly waived his right to directly appeal his sentence. See United States v. Portillo, 18 F.3d 290, 292 (5th Cir. 1994). Accordingly, the appeal is dismissed.