--- old/src/share/vm/gc_implementation/shared/adaptiveSizePolicy.cpp	2015-04-23 16:54:53.652428337 -0400
+++ new/src/share/vm/gc_implementation/shared/adaptiveSizePolicy.cpp	2015-04-23 16:54:52.972389633 -0400
@@ -193,8 +193,9 @@
      (!FLAG_IS_DEFAULT(ParallelGCThreads) && !ForceDynamicNumberOfGCThreads)) {
     new_active_workers = total_workers;
   } else {
+    uintx min_workers = (total_workers == 1) ? 1 : 2;
     new_active_workers = calc_default_active_workers(total_workers,
-                                                     2, /* Minimum number of workers */
+                                                     min_workers,
                                                      active_workers,
                                                      application_workers);
   }