--- a/hotspot/src/share/vm/gc_implementation/shared/immutableSpace.hpp	Wed Jun 27 15:23:36 2012 +0200
+++ b/hotspot/src/share/vm/gc_implementation/shared/immutableSpace.hpp	Thu Jun 28 17:03:16 2012 -0400
@@ -33,7 +33,7 @@
 // Invariant: bottom() and end() are on page_size boundaries and
 // bottom() <= end()
 
-class ImmutableSpace: public CHeapObj {
+class ImmutableSpace: public CHeapObj<mtGC> {
   friend class VMStructs;
  protected:
   HeapWord* _bottom;