Eddie Sanford Spykes (Spykes) appeals the sentence imposed after his plea of guilty to one count of conspiring to manufacture methamphetamine between 1988 and 2001. He contends that the district court erred by applying the 1998 edition of the Sentencing Guidelines to relevant conduct that occurred in 1988. He did not object to the edition of the guidelines used in the district court, so we review only for plain error. See United States v. Krout, 66 F.3d 1420, 1434 (5th Cir. 1995).

The record refutes Spykes’s contention that the district court applied U.S.S.G. § 2D1.11, a guideline that did not take effect until 1991. Spykes benefitted when the district court declined to apply the 2002 edition of guidelines due to ex post facto concerns about a provision that would have raised Spykes’s offense level. See U.S.S.G. § lBl.ll(b)(l). The district court’s application of guidelines that were in effect during the conspiracy was not a clear or obvious error that affected Spykes’s substantial rights. See U.S.S.G. § 1B1.11, comment, (n.2); United States v. Thomas, 12 F.3d 1350, 1370-71 (5th Cir. *732 1994). The judgment of the district court is AFFIRMED.

AFFIRMED.