diff --git a/lib/Support/FoldingSet.cpp b/lib/Support/FoldingSet.cpp
index d2e35b8eb67..1568342e9c9 100644
--- a/lib/Support/FoldingSet.cpp
+++ b/lib/Support/FoldingSet.cpp
@@ -92,7 +92,7 @@ void FoldingSetNodeID::AddInteger(long long I) {
 }
 void FoldingSetNodeID::AddInteger(unsigned long long I) {
   AddInteger(unsigned(I));
-  if ((uint64_t)(int)I != I)
+  if ((uint64_t)(unsigned)I != I)
     Bits.push_back(unsigned(I >> 32));
 }