--- old/src/hotspot/share/gc/z/zValue.hpp	2018-09-18 21:52:01.016828308 +0200
+++ new/src/hotspot/share/gc/z/zValue.hpp	2018-09-18 21:52:00.710815112 +0200
@@ -131,7 +131,7 @@
 class ZValueIterator;
 
 template <typename S, typename T>
-class ZValue {
+class ZValue : public CHeapObj<mtGC> {
 private:
   const uintptr_t _addr;