--- old/src/share/vm/gc/serial/genMarkSweep.hpp	2015-10-08 22:15:42.853418988 +0200
+++ new/src/share/vm/gc/serial/genMarkSweep.hpp	2015-10-08 22:15:42.803420182 +0200
@@ -29,6 +29,7 @@
 
 class GenMarkSweep : public MarkSweep {
   friend class VM_MarkSweep;
+  friend class ShenandoahMarkCompact;
   friend class G1MarkSweep;
  public:
   static void invoke_at_safepoint(ReferenceProcessor* rp, bool clear_all_softrefs);