--- a/hotspot/src/share/vm/gc_implementation/g1/g1MMUTracker.hpp	Wed Jun 27 15:23:36 2012 +0200
+++ b/hotspot/src/share/vm/gc_implementation/g1/g1MMUTracker.hpp	Thu Jun 28 17:03:16 2012 -0400
@@ -34,7 +34,7 @@
 /***** ALL TIMES ARE IN SECS!!!!!!! *****/
 
 // this is the "interface"
-class G1MMUTracker: public CHeapObj {
+class G1MMUTracker: public CHeapObj<mtGC> {
 protected:
   double          _time_slice;
   double          _max_gc_time; // this is per time slice