--- a/src/hotspot/share/oops/instanceMirrorKlass.cpp	Fri Aug 24 09:38:11 2018 +0200
+++ b/src/hotspot/share/oops/instanceMirrorKlass.cpp	Fri Jul 06 16:04:19 2018 +0200
@@ -56,7 +56,7 @@
 }
 
 int InstanceMirrorKlass::oop_size(oop obj) const {
-  return java_lang_Class::oop_size(obj);
+  return java_lang_Class::oop_size_raw(obj);
 }
 
 int InstanceMirrorKlass::compute_static_oop_field_count(oop obj) {