--- old/src/hotspot/share/gc/z/zHeap.inline.hpp	2019-04-10 18:50:28.097884200 -0400
+++ new/src/hotspot/share/gc/z/zHeap.inline.hpp	2019-04-10 18:50:27.190793500 -0400
@@ -135,7 +135,7 @@
 }
 
 inline bool ZHeap::is_oop(oop object) const {
-  return ZAddress::is_good(ZOop::to_address(object));
+  return ZOop::is_good(object);
 }
 
 #endif // SHARE_GC_Z_ZHEAP_INLINE_HPP