diff --git a/addons/document/document.py b/addons/document/document.py
index 69e123b87eb..b4a43fffa99 100644
--- a/addons/document/document.py
+++ b/addons/document/document.py
@@ -64,7 +64,7 @@ class document_file(osv.osv):
                     "SET parent_id = %s, db_datas = decode(encode(db_datas,'escape'), 'base64') " \
                     "WHERE parent_id IS NULL", (parent_id,))
 
-        cr.execute("UPDATE ir_attachment SET file_size=length(db_datas) WHERE file_size = 0;")
+        cr.execute("UPDATE ir_attachment SET file_size=length(db_datas) WHERE file_size = 0 and type = 'binary'")
 
         cr.execute("ALTER TABLE ir_attachment ALTER parent_id SET NOT NULL")