--- a/src/hotspot/share/gc/g1/heapRegion.hpp	Mon Mar 26 16:51:41 2018 +0200
+++ b/src/hotspot/share/gc/g1/heapRegion.hpp	Mon Mar 26 16:51:43 2018 +0200
@@ -713,6 +713,7 @@
 class HeapRegionClosure : public StackObj {
   friend class HeapRegionManager;
   friend class G1CollectionSet;
+  friend class CollectionSetChooser;
 
   bool _is_complete;
   void set_incomplete() { _is_complete = false; }