--- old/src/share/vm/memory/modRefBarrierSet.hpp	2010-11-10 13:14:21.000000000 +0100
+++ new/src/share/vm/memory/modRefBarrierSet.hpp	2010-11-10 13:14:20.000000000 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2008, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -22,6 +22,11 @@
  *
  */
 
+#ifndef SHARE_VM_MEMORY_MODREFBARRIERSET_HPP
+#define SHARE_VM_MEMORY_MODREFBARRIERSET_HPP
+
+#include "memory/barrierSet.hpp"
+
 // This kind of "BarrierSet" allows a "CollectedHeap" to detect and
 // enumerate ref fields that have been modified (since the last
 // enumeration), using a card table.
@@ -111,3 +116,5 @@
 #endif
 
 };
+
+#endif // SHARE_VM_MEMORY_MODREFBARRIERSET_HPP