diff --git a/product/ERP5Type/Core/Folder.py b/product/ERP5Type/Core/Folder.py
index 93d07042bfb250316207e508a58353dcb65da86c..7834bfe3cc84022d93d5b3c4f29757f9ebd9d5bf 100644
--- a/product/ERP5Type/Core/Folder.py
+++ b/product/ERP5Type/Core/Folder.py
@@ -759,7 +759,7 @@ class Folder(CopyContainer, CMFBTreeFolder, CMFHBTreeFolder, Base, FolderMixIn,
         return []
       return CMFBTreeFolder.objectIds(self, spec)
 
-  def objectItems(self, **kw):
+  def objectItems(self, spec=None, **kw):
     if self._folder_handler == HBTREE_HANDLER:
       if  self._htree is None:
         return []