diff --git a/include/llvm/ADT/DenseMap.h b/include/llvm/ADT/DenseMap.h
index d1f413662a7..492dd451b2c 100644
--- a/include/llvm/ADT/DenseMap.h
+++ b/include/llvm/ADT/DenseMap.h
@@ -176,6 +176,7 @@ public:
   
   DenseMap& operator=(const DenseMap& other) {
     CopyFrom(other);
+    return *this;
   }
   
 private: