diff --git a/compiler/rustc_mir_build/src/thir/pattern/usefulness.rs b/compiler/rustc_mir_build/src/thir/pattern/usefulness.rs
index 010fe4fd524..553c0ab3166 100644
--- a/compiler/rustc_mir_build/src/thir/pattern/usefulness.rs
+++ b/compiler/rustc_mir_build/src/thir/pattern/usefulness.rs
@@ -439,6 +439,7 @@ impl<'p, 'tcx> PatStack<'p, 'tcx> {
         self.pats[0]
     }
 
+    #[inline]
     fn head_ctor<'a>(&'a self, cx: &MatchCheckCtxt<'p, 'tcx>) -> &'a Constructor<'tcx> {
         self.head_ctor.get_or_init(|| Constructor::from_pat(cx, self.head()))
     }