--- old/src/hotspot/share/prims/whitebox.cpp	2018-06-08 19:45:36.144809425 +0200
+++ new/src/hotspot/share/prims/whitebox.cpp	2018-06-08 19:45:35.879797927 +0200
@@ -347,7 +347,12 @@
     ParallelScavengeHeap* psh = ParallelScavengeHeap::heap();
     return !psh->is_in_young(p);
   }
-#endif // INCLUDE_PARALLELGC
+#endif
+#if INCLUDE_ZGC
+  if (UseZGC) {
+    return Universe::heap()->is_in(p);
+  }
+#endif
   GenCollectedHeap* gch = GenCollectedHeap::heap();
   return !gch->is_in_young(p);
 WB_END