--- old/src/hotspot/share/classfile/systemDictionary.hpp	2019-01-10 15:10:51.665539413 +0100
+++ new/src/hotspot/share/classfile/systemDictionary.hpp	2019-01-10 15:10:51.397538880 +0100
@@ -140,6 +140,8 @@
   do_klass(ThreadGroup_klass,                           java_lang_ThreadGroup                                 ) \
   do_klass(Properties_klass,                            java_util_Properties                                  ) \
   do_klass(Module_klass,                                java_lang_Module                                      ) \
+  do_klass(ModuleDescriptor_klass,                      java_lang_module_ModuleDescriptor                     ) \
+  do_klass(ModuleDescriptor_Version_klass,              java_lang_module_ModuleDescriptor_Version             ) \
   do_klass(reflect_AccessibleObject_klass,              java_lang_reflect_AccessibleObject                    ) \
   do_klass(reflect_Field_klass,                         java_lang_reflect_Field                               ) \
   do_klass(reflect_Parameter_klass,                     java_lang_reflect_Parameter                           ) \