diff --git a/include/llvm/Support/HashExtras.h b/include/llvm/Support/HashExtras.h
index ecd572e3d9e..6ea831e78f0 100644
--- a/include/llvm/Support/HashExtras.h
+++ b/include/llvm/Support/HashExtras.h
@@ -19,4 +19,9 @@ template <> struct hash<string> {
   }
 };
 
+// Provide a hash function for arbitrary pointers...
+template <class T> struct hash<T *> {
+  inline size_t operator()(const T *Val) const { return (size_t)Val; }
+};
+
 #endif