diff --git a/include/llvm/ADT/FoldingSet.h b/include/llvm/ADT/FoldingSet.h
index 2e74f2c8c15..2a7b802981f 100644
--- a/include/llvm/ADT/FoldingSet.h
+++ b/include/llvm/ADT/FoldingSet.h
@@ -106,7 +106,7 @@ namespace llvm {
 /// back to the bucket to facilitate node removal.
 /// 
 class FoldingSetImpl {
-private:
+protected:
   /// Buckets - Array of bucket chains.
   ///
   void **Buckets;