--- a/src/share/vm/memory/referenceProcessor.cpp	Mon Feb 11 15:40:07 2008 -0800
+++ b/src/share/vm/memory/referenceProcessor.cpp	Tue Feb 12 16:07:46 2008 -0800
@@ -85,7 +85,7 @@ ReferenceProcessor* ReferenceProcessor::
   ReferenceProcessor* rp =
     new ReferenceProcessor(span, atomic_discovery,
                            mt_discovery, mt_degree,
-                           mt_processing);
+                           mt_processing && (parallel_gc_threads > 0));
   if (rp == NULL) {
     vm_exit_during_initialization("Could not allocate ReferenceProcessor object");
   }