--- old/src/hotspot/share/gc/z/zCollectedHeap.hpp	2020-08-07 13:16:06.226148998 +0200
+++ new/src/hotspot/share/gc/z/zCollectedHeap.hpp	2020-08-07 13:16:06.102147027 +0200
@@ -107,8 +107,6 @@
 
   virtual WorkGang* get_safepoint_workers();
 
-  virtual jlong millis_since_last_gc();
-
   virtual void gc_threads_do(ThreadClosure* tc) const;
 
   virtual VirtualSpaceSummary create_heap_space_summary();