--- a/src/hotspot/share/gc/z/zMarkStack.hpp	Tue Aug 14 00:15:56 2018 -0400
+++ b/src/hotspot/share/gc/z/zMarkStack.hpp	Mon Aug 13 14:04:42 2018 +0200
@@ -76,6 +76,7 @@
 class ZMarkStackSpace {
 private:
   ZLock              _expand_lock;
+  uintptr_t          _start;
   volatile uintptr_t _top;
   volatile uintptr_t _end;