--- old/src/share/vm/oops/instanceRefKlass.cpp	2017-08-17 11:33:07.556089749 -0400
+++ new/src/share/vm/oops/instanceRefKlass.cpp	2017-08-17 11:33:07.327510787 -0400
@@ -72,12 +72,12 @@
   // Verify referent field
   oop referent = java_lang_ref_Reference::referent(obj);
   if (referent != NULL) {
-    guarantee(referent->is_oop(), "referent field heap failed");
+    guarantee(oopDesc::is_oop(referent), "referent field heap failed");
   }
   // Verify next field
   oop next = java_lang_ref_Reference::next(obj);
   if (next != NULL) {
-    guarantee(next->is_oop(), "next field should be an oop");
+    guarantee(oopDesc::is_oop(next), "next field should be an oop");
     guarantee(next->is_instance(), "next field should be an instance");
     guarantee(InstanceKlass::cast(next->klass())->is_reference_instance_klass(), "next field verify failed");
   }