--- old/share/gc/g1/g1CollectedHeap.hpp	2018-06-12 04:14:32.155190724 -0700
+++ new/share/gc/g1/g1CollectedHeap.hpp	2018-06-12 04:14:32.127190724 -0700
@@ -1386,6 +1386,7 @@
 private:
   void print_heap_regions() const;
   void print_regions_on(outputStream* st) const;
+  size_t expand_old_gen_on_nvdimm(size_t max_byte_size);
 
 public:
   virtual void print_on(outputStream* st) const;