--- old/src/share/vm/memory/cardGeneration.hpp	2015-05-13 14:05:32.953101138 +0200
+++ new/src/share/vm/memory/cardGeneration.hpp	2015-05-13 14:05:32.829097016 +0200
@@ -89,7 +89,7 @@
 
   void space_iterate(SpaceClosure* blk, bool usedOnly = false);
 
-  void younger_refs_iterate(OopsInGenClosure* blk);
+  void younger_refs_iterate(OopsInGenClosure* blk, uint n_threads);
 
   bool is_in(const void* p) const;