diff --git a/product/ERP5Type/Core/MemcachedPlugin.py b/product/ERP5Type/Core/MemcachedPlugin.py
index 2008ae2771024ca83426e3640c15a6de9579e5c9..8265bc283edac9d67ab46295e41b4ad4dacd13f6 100644
--- a/product/ERP5Type/Core/MemcachedPlugin.py
+++ b/product/ERP5Type/Core/MemcachedPlugin.py
@@ -30,6 +30,8 @@
 from AccessControl import ClassSecurityInfo
 from Products.ERP5Type.XMLObject import XMLObject
 from Products.ERP5Type import PropertySheet
+from Products.ERP5.PropertySheet.SortIndex import SortIndex
+from Products.ERP5.PropertySheet.Url import Url
 from Products.ERP5Type import Permissions
 
 class MemcachedPlugin(XMLObject):
@@ -53,6 +55,6 @@ class MemcachedPlugin(XMLObject):
   property_sheets = ( PropertySheet.Base
                     , PropertySheet.SimpleItem
                     , PropertySheet.Folder
-                    , PropertySheet.SortIndex
-                    , PropertySheet.Url
+                    , SortIndex
+                    , Url
                     )