diff --git a/product/ERP5Type/dynamic/lazy_class.py b/product/ERP5Type/dynamic/lazy_class.py
index 14ff5d7b52fedf6dd941c66ca945cdeb212d6a1e..d1ceb05c12fd0bb099436cb415670de63c2b4bed 100644
--- a/product/ERP5Type/dynamic/lazy_class.py
+++ b/product/ERP5Type/dynamic/lazy_class.py
@@ -227,4 +227,6 @@ class PortalTypeMetaClass(GhostBaseMetaClass):
       ERP5Base.aq_method_lock.release()
 
 def generateLazyPortalTypeClass(portal_type_name):
-  return PortalTypeMetaClass(portal_type_name, (InitGhostBase,), {})
+  return PortalTypeMetaClass(portal_type_name,
+                             (InitGhostBase,),
+                             dict(portal_type=portal_type_name))