Nathaniel Demetrius Gordon appeals the district court’s revocation of his supervised release. Gordon argues that the protections afforded by Boykin v. Alabama, 395 U.S. 238, 89 S.Ct. 1709, 23 L.Ed.2d 274 (1969), and Fed. R.Crim. P. 11 should be extended to supervised-release revocation proceedings. He contends that his revocation should be vacated because the district court did not inquire on the record whether his plea of true was knowing and voluntary.

Because Gordon raises this argument for the first time on appeal, this court’s review is for plain error only. See United States v. Olano, 507 U.S. 725, 732-33, 113 S.Ct. 1770, 123 L.Ed.2d 508 (1993). Contrary to Gordon’s assertion, plain error review applies to issues of law raised for the first time on appeal. See id.

In United States v. Johns, 625 F.2d 1175, 1176 (5th Cir. 1980), this court held that Fed. R.Crim. P. 11 is inapplicable to probation-revocation hearings. The issue whether the district court should have complied with Fed. R.Crim. P. 11 at Gordon’s revocation hearing is foreclosed by Johns. Thus, Gordon fails to demonstrate that the district court erred by not complying with Fed. R.Crim. P. 11.

This court has not yet addressed the issue whether Boykin is applicable to supervised-release or probation-revocation hearings. See Johns, 625 F.2d at 1176. *385 Given the lack of controlling authority in this circuit on this issue, any error by the district court with regard to Boykin was not clear or obvious and, therefore, does not meet the plain-error standard. See United States v. Dupre, 117 F.3d 810, 817 (5th Cir. 1997). Accordingly, the district court’s judgment is AFFIRMED.