--- old/src/share/vm/gc/g1/g1CollectedHeap.hpp	2017-07-12 12:13:41.777587700 +0200
+++ new/src/share/vm/gc/g1/g1CollectedHeap.hpp	2017-07-12 12:13:41.681584724 +0200
@@ -111,8 +111,6 @@
   bool do_object_b(oop p);
 };
 
-class G1RefineCardConcurrentlyClosure;
-
 class G1RegionMappingChangedListener : public G1MappingChangedListener {
  private:
   void reset_from_card_cache(uint start_idx, size_t num_regions);