--- a/hotspot/src/cpu/x86/vm/stubGenerator_x86_64.cpp	Thu Jun 13 11:16:38 2013 -0700
+++ b/hotspot/src/cpu/x86/vm/stubGenerator_x86_64.cpp	Thu Jun 13 22:02:40 2013 -0700
@@ -81,7 +81,7 @@
  private:
 
 #ifdef PRODUCT
-#define inc_counter_np(counter) (0)
+#define inc_counter_np(counter) ((void)0)
 #else
   void inc_counter_np_(int& counter) {
     // This can destroy rscratch1 if counter is far from the code cache