diff --git a/compiler/rustc_middle/src/ty/mod.rs b/compiler/rustc_middle/src/ty/mod.rs
index 4c95f0748d32..2e1be6e322f8 100644
--- a/compiler/rustc_middle/src/ty/mod.rs
+++ b/compiler/rustc_middle/src/ty/mod.rs
@@ -1994,7 +1994,7 @@ impl<'tcx> TyCtxt<'tcx> {
     pub fn trait_of_item(self, def_id: DefId) -> Option<DefId> {
         if let DefKind::AssocConst | DefKind::AssocFn | DefKind::AssocTy = self.def_kind(def_id) {
             let parent = self.parent(def_id);
-            if let DefKind::Trait | DefKind::TraitAlias = self.def_kind(parent) {
+            if let DefKind::Trait = self.def_kind(parent) {
                 return Some(parent);
             }
         }