diff --git a/lib/Support/FoldingSet.cpp b/lib/Support/FoldingSet.cpp
index 6f7f5ea..0ccb3a6 100644
--- a/lib/Support/FoldingSet.cpp
+++ b/lib/Support/FoldingSet.cpp
@@ -40,6 +40,9 @@
 void FoldingSetImpl::NodeID::AddInteger(unsigned I) {
   Bits.push_back(I);
 }
+void FoldingSetImpl::NodeID::AddInteger(int64_t I) {
+  AddInteger((uint64_t)I);
+}
 void FoldingSetImpl::NodeID::AddInteger(uint64_t I) {
   Bits.push_back(unsigned(I));