diff --git a/llvm/include/llvm/ADT/EquivalenceClasses.h b/llvm/include/llvm/ADT/EquivalenceClasses.h
index 1a2331c1a0322..7df0d1557af87 100644
--- a/llvm/include/llvm/ADT/EquivalenceClasses.h
+++ b/llvm/include/llvm/ADT/EquivalenceClasses.h
@@ -180,8 +180,8 @@ template <class ElemTy> class EquivalenceClasses {
   }
 
   /// Returns true if \p V is contained an equivalence class.
-  bool contains(const ElemTy &V) const {
-    return TheMapping.find(V) != TheMapping.end();
+  [[nodiscard]] bool contains(const ElemTy &V) const {
+    return TheMapping.contains(V);
   }
 
   /// getLeaderValue - Return the leader for the specified value that is in the