diff --git a/include/llvm/ADT/DenseMap.h b/include/llvm/ADT/DenseMap.h
index d4106199643..31fd6d899da 100644
--- a/include/llvm/ADT/DenseMap.h
+++ b/include/llvm/ADT/DenseMap.h
@@ -618,7 +618,7 @@ public:
     unsigned OldNumBuckets = NumBuckets;
     BucketT *OldBuckets = Buckets;
 
-    allocateBuckets(std::max<unsigned>(64, NextPowerOf2(AtLeast-1)));
+    allocateBuckets(std::max<unsigned>(64, static_cast<unsigned>(NextPowerOf2(AtLeast-1))));
     assert(Buckets);
     if (!OldBuckets) {
       this->BaseT::initEmpty();