diff --git a/include/llvm/IR/ValueMap.h b/include/llvm/IR/ValueMap.h
index ad518ac053b..d928f6a2787 100644
--- a/include/llvm/IR/ValueMap.h
+++ b/include/llvm/IR/ValueMap.h
@@ -99,7 +99,7 @@ class ValueMap {
   explicit ValueMap(const ExtraData &Data, unsigned NumInitBuckets = 64)
       : Map(NumInitBuckets), Data(Data) {}
 
-  bool hasMD() const { return MDMap; }
+  bool hasMD() const { return static_cast<bool>(MDMap); }
   MDMapT &MD() {
     if (!MDMap)
       MDMap.reset(new MDMapT);