--- old/src/share/vm/gc_implementation/parallelScavenge/vmStructs_parallelgc.hpp	2010-11-16 18:12:53.000000000 +0100
+++ new/src/share/vm/gc_implementation/parallelScavenge/vmStructs_parallelgc.hpp	2010-11-16 18:12:52.000000000 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2007, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2007, 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 +22,9 @@
  *
  */
 
+#ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_VMSTRUCTS_PARALLELGC_HPP
+#define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_VMSTRUCTS_PARALLELGC_HPP
+
 #define VM_STRUCTS_PARALLELGC(nonstatic_field, \
                    static_field) \
                                                                                                                                      \
@@ -93,3 +96,5 @@
   declare_toplevel_type(ASPSOldGen*)                                      \
   declare_toplevel_type(PSPermGen*)                                       \
   declare_toplevel_type(ParallelScavengeHeap*)
+
+#endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_VMSTRUCTS_PARALLELGC_HPP