--- a/src/hotspot/share/gc/z/zMark.cpp	Tue Apr 09 12:47:34 2019 +0200
+++ b/src/hotspot/share/gc/z/zMark.cpp	Wed Apr 10 12:45:32 2019 +0200
@@ -200,7 +200,7 @@
 }
 
 bool ZMark::is_array(uintptr_t addr) const {
-  return ZOop::to_oop(addr)->is_objArray();
+  return ZOop::from_address(addr)->is_objArray();
 }
 
 void ZMark::push_partial_array(uintptr_t addr, size_t size, bool finalizable) {
@@ -347,9 +347,9 @@
   }
 
   if (is_array(addr)) {
-    follow_array_object(objArrayOop(ZOop::to_oop(addr)), finalizable);
+    follow_array_object(objArrayOop(ZOop::from_address(addr)), finalizable);
   } else {
-    follow_object(ZOop::to_oop(addr), finalizable);
+    follow_object(ZOop::from_address(addr), finalizable);
   }
 }