diff -r e33f46fc48ed -r f95d63e2154a src/share/vm/gc_implementation/g1/heapRegionRemSet.hpp
--- a/src/share/vm/gc_implementation/g1/heapRegionRemSet.hpp	Tue Nov 23 15:01:43 2010 -0500
+++ b/src/share/vm/gc_implementation/g1/heapRegionRemSet.hpp	Tue Nov 23 13:22:55 2010 -0800
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001, 2009, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 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_GC_IMPLEMENTATION_G1_HEAPREGIONREMSET_HPP
+#define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONREMSET_HPP
+
+#include "gc_implementation/g1/sparsePRT.hpp"
+
 // Remembered set for a heap region.  Represent a set of "cards" that
 // contain pointers into the owner heap region.  Cards are defined somewhat
 // abstractly, in terms of what the "BlockOffsetTable" in use can parse.
@@ -426,3 +431,5 @@
 };
 
 #endif
+
+#endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONREMSET_HPP