--- a/src/hotspot/share/gc/z/zCollectedHeap.hpp	Tue Apr 02 10:04:25 2019 +0200
+++ b/src/hotspot/share/gc/z/zCollectedHeap.hpp	Tue Apr 02 10:04:25 2019 +0200
@@ -73,6 +73,8 @@
   virtual bool is_maximal_no_gc() const;
   virtual bool is_in(const void* p) const;
 
+  virtual uint32_t hash_oop(oop obj) const;
+
   virtual HeapWord* mem_allocate(size_t size, bool* gc_overhead_limit_was_exceeded);
   virtual MetaWord* satisfy_failed_metadata_allocation(ClassLoaderData* loader_data,
                                                        size_t size,