diff --git a/include/llvm/ADT/DenseMap.h b/include/llvm/ADT/DenseMap.h
index 0ceca926c68..07a17535fc9 100644
--- a/include/llvm/ADT/DenseMap.h
+++ b/include/llvm/ADT/DenseMap.h
@@ -256,6 +256,7 @@ public:
     DestroyAll();
     init(0);
     swap(other);
+    return *this;
   }
 #endif