--- old/src/share/vm/gc/g1/dirtyCardQueue.hpp	2016-04-06 17:17:17.758383588 +0200
+++ new/src/share/vm/gc/g1/dirtyCardQueue.hpp	2016-04-06 17:17:17.654383587 +0200
@@ -37,7 +37,7 @@
 public:
   // Process the card whose card table entry is "card_ptr".  If returns
   // "false", terminate the iteration early.
-  virtual bool do_card_ptr(jbyte* card_ptr, uint worker_i) = 0;
+  virtual bool do_card_ptr(volatile jbyte* card_ptr, uint worker_i) = 0;
 };
 
 // A ptrQueue whose elements are "oops", pointers to object heads.