--- old/src/share/vm/gc/g1/g1ParScanThreadState.hpp	2016-04-06 17:17:21.958383638 +0200
+++ new/src/share/vm/gc/g1/g1ParScanThreadState.hpp	2016-04-06 17:17:21.858383637 +0200
@@ -106,7 +106,7 @@
       size_t card_index = ctbs()->index_for(p);
       // If the card hasn't been added to the buffer, do it.
       if (ctbs()->mark_card_deferred(card_index)) {
-        dirty_card_queue().enqueue((jbyte*)ctbs()->byte_for_index(card_index));
+        dirty_card_queue().enqueue((volatile jbyte*)ctbs()->byte_for_index(card_index));
       }
     }
   }