diff --git a/include/llvm/ADT/ValueMap.h b/include/llvm/ADT/ValueMap.h
index 181fe71e370..af041fe5216 100644
--- a/include/llvm/ADT/ValueMap.h
+++ b/include/llvm/ADT/ValueMap.h
@@ -83,6 +83,7 @@ class ValueMap {
   MapT Map;
   ExtraData Data;
   ValueMap(const ValueMap&); // DO NOT IMPLEMENT
+  ValueMap& operator=(const ValueMap&); // DO NOT IMPLEMENT
 public:
   typedef KeyT key_type;
   typedef ValueT mapped_type;
@@ -160,12 +161,6 @@ public:
     return Map[Wrap(Key)];
   }
 
-  ValueMap& operator=(const ValueMap& Other) {
-    Map = Other.Map;
-    Data = Other.Data;
-    return *this;
-  }
-
   /// isPointerIntoBucketsArray - Return true if the specified pointer points
   /// somewhere into the ValueMap's array of buckets (i.e. either to a key or
   /// value in the ValueMap).