--- old/src/share/vm/gc_implementation/shared/gcTrace.cpp	2013-02-18 14:14:30.000000000 +0100
+++ new/src/share/vm/gc_implementation/shared/gcTrace.cpp	2013-02-18 14:14:30.000000000 +0100
@@ -33,9 +33,9 @@
 #define assert_unset_gc_id() assert(_shared_gc_info.id() == SharedGCInfo::UNSET_GCID, "GC already started?")
 #define assert_set_gc_id() assert(_shared_gc_info.id() != SharedGCInfo::UNSET_GCID, "GC not started?")
 
-static volatile jlong GCTracer_next_gc_id = 0;
+static jlong GCTracer_next_gc_id = 0;
 static GCId create_new_gc_id() {
-  return Atomic::add((jlong)1, &GCTracer_next_gc_id);
+  return GCTracer_next_gc_id++;
 }
 
 void GCTracer::report_gc_start_impl(GCCause::Cause cause, jlong timestamp) {