--- a/hotspot/src/share/vm/gc_implementation/g1/g1RemSet.hpp	Tue Nov 23 15:01:43 2010 -0500
+++ b/hotspot/src/share/vm/gc_implementation/g1/g1RemSet.hpp	Tue Nov 23 13:22:55 2010 -0800
@@ -22,6 +22,9 @@
  *
  */
 
+#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_HPP
+#define SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_HPP
+
 // A G1RemSet provides ways of iterating over pointers into a selected
 // collection set.
 
@@ -231,3 +234,5 @@
   bool apply_to_weak_ref_discovered_field() { return true; }
 };
 
+
+#endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_HPP