--- old/share/gc/g1/g1CollectedHeap.hpp	2018-06-15 09:47:36.278912395 -0700
+++ new/share/gc/g1/g1CollectedHeap.hpp	2018-06-15 09:47:36.234912393 -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;