--- old/src/share/vm/memory/sharedHeap.cpp	2013-06-27 15:42:12.972854000 -0700
+++ new/src/share/vm/memory/sharedHeap.cpp	2013-06-27 15:42:12.915847000 -0700
@@ -65,7 +65,8 @@
   }
   _sh = this;  // ch is static, should be set only once.
   if ((UseParNewGC ||
-      (UseConcMarkSweepGC && CMSParallelRemarkEnabled) ||
+      (UseConcMarkSweepGC && (CMSParallelInitialMarkEnabled ||
+                              CMSParallelRemarkEnabled)) ||
        UseG1GC) &&
       ParallelGCThreads > 0) {
     _workers = new FlexibleWorkGang("Parallel GC Threads", ParallelGCThreads,