diff --git a/include/llvm/ADT/FoldingSet.h b/include/llvm/ADT/FoldingSet.h
index 1b2c94c35f8..a056d667c66 100644
--- a/include/llvm/ADT/FoldingSet.h
+++ b/include/llvm/ADT/FoldingSet.h
@@ -278,6 +278,8 @@ public:
 
   bool operator==(FoldingSetNodeIDRef) const;
 
+  bool operator!=(FoldingSetNodeIDRef RHS) const { return !(*this == RHS); }
+
   /// Used to compare the "ordering" of two nodes as defined by the
   /// profiled bits and their ordering defined by memcmp().
   bool operator<(FoldingSetNodeIDRef) const;
@@ -331,6 +333,9 @@ public:
   bool operator==(const FoldingSetNodeID &RHS) const;
   bool operator==(const FoldingSetNodeIDRef RHS) const;
 
+  bool operator!=(const FoldingSetNodeID &RHS) const { return !(*this == RHS); }
+  bool operator!=(const FoldingSetNodeIDRef RHS) const { return !(*this ==RHS);}
+
   /// Used to compare the "ordering" of two nodes as defined by the
   /// profiled bits and their ordering defined by memcmp().
   bool operator<(const FoldingSetNodeID &RHS) const;