OPINION OF THE COURT
This sentencing appeal presents the narrow issue whether the two-level upward adjustment for obstruction of justice under United States Sentencing Guideline § 3C1.1 is mandatory once the sentencing court has determined that the factual predicates for the enhancement have been met. The appellant, Stephen A. Williamson, contends that it is not. We hold, however, consistent with all the other circuits that have previously interpreted this Guideline, that it is. Accordingly the district court’s judgment imposing sentence on Williamson will be affirmed.
I. BACKGROUND
The narrow scope of Williamson’s ap.peal renders the facts underlying his conviction and sentencing largely tangential to our decision, hence we need only outline them. Williamson was convicted of bank robbery following a jury trial and was thereafter sentenced to sixty-three months imprisonment to be followed by a three-year term of supervised release. In calculating the applicable Sentencing Guideline range, the district court determined that Williamson had perjured himself at trial — a finding which the district court believed rendered the imposition of a two-point offense level enhancement for obstruction of justice mandatory. On appeal, Williamson challenges this aspect of his sentence. Notably, however, he does not argue that the district court erred in determining that he committed perjury at his trial or that his perjurious testimony did not amount to an attempt to obstruct justice within the applicable guideline provision. Rather, Williamson appeals solely upon the narrow ground that the district court erroneously believed that it was required to apply the obstruction of justice enhancement once it determined on the facts that Williamson had committed perjury. 1
*505 II. DISCUSSION
Section 3C1.1 of the Sentencing Guidelines provides:
If the defendant willfully obstructed or impeded, or attempted to obstruct or impede, the administration of justice during the investigation, prosecution, or sentencing of the instant offense, increase the offense level by 2 levels.
U.S.S.G. § 3C1.1. Williamson argues that the failure of this Guideline to include words such as “must” or “shall” renders it ambiguous as to whether the increase in offense level must automatically follow a determination that the defendant has engaged in qualifying conduct. This ambiguity, he contends, requires application of the rule of lenity and thus the resolution of all doubts regarding the Guideline’s construction in his favor. We disagree, finding nothing ambiguous about U.S.S.G. § 3C1.1. Rather, the logical structure of the Guideline (“if A, then B”) clearly commands that a definite result — a two level increase in offense level — must follow the occurrence of a stated conditional event — a finding that the defendant willfully, obstructed ... the administration of justice. This reading is supported by the language of a recent Supreme Court opinion and is shared by every circuit court of appeals that has addressed the issue.
In
United States v. Dunnigan,
We join in this broad consensus interpreting the plain language of § 3C1.1, and accordingly hold that the two-level enhancement is mandatory once a district court determines that a defendant has obstructed justice.
The judgment of the district court will be affirmed.
Notes
. The district court had jurisdiction over this criminal matter under 18 U.S.C. § 3231. We exercise jurisdiction over the appeal under 28 U.S.C. § 1291 and 18 U.S.C. § 3742. Our re
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view of the district court's construction and interpretation of U.S.S.G. § 3C1.1, or any sentencing guideline, is plenary.
See United States v. Powell,
