diff --git a/lib/Support/FoldingSet.cpp b/lib/Support/FoldingSet.cpp
index 6daa157..8014043 100644
--- a/lib/Support/FoldingSet.cpp
+++ b/lib/Support/FoldingSet.cpp
@@ -170,7 +170,7 @@
   memset(Buckets, 0, NumBuckets*sizeof(void*));
   
   // Set the very last bucket to be a non-null "pointer".
-  Buckets[NumBuckets] = reinterpret_cast<void*>(-2);
+  Buckets[NumBuckets] = reinterpret_cast<void*>(-1);
 }
 FoldingSetImpl::~FoldingSetImpl() {
   delete [] Buckets;