--- old/src/share/vm/gc/serial/defNewGeneration.hpp	2015-05-20 11:05:18.961972217 +0200
+++ new/src/share/vm/gc/serial/defNewGeneration.hpp	2015-05-20 11:05:18.789966405 +0200
@@ -255,7 +255,7 @@
   // Iteration
   void object_iterate(ObjectClosure* blk);
 
-  void younger_refs_iterate(OopsInGenClosure* cl);
+  void younger_refs_iterate(OopsInGenClosure* cl, uint n_threads);
 
   void space_iterate(SpaceClosure* blk, bool usedOnly = false);