diff --git a/openerp/addons/base/ir/ir_ui_view.py b/openerp/addons/base/ir/ir_ui_view.py
index ea7b11c426d..341f1ad7119 100644
--- a/openerp/addons/base/ir/ir_ui_view.py
+++ b/openerp/addons/base/ir/ir_ui_view.py
@@ -203,7 +203,7 @@ class view(osv.osv):
         # Sanity checks: the view should not break anything upon rendering!
         # Any exception raised below will cause a transaction rollback.
         for view in self.browse(cr, uid, ids, context):
-            view_def = self.read_combined(cr, uid, view.id, None, context=context)
+            view_def = self.read_combined(cr, uid, view.id, ['arch'], context=context)
             view_arch_utf8 = view_def['arch']
             if view.type != 'qweb':
                 view_doc = etree.fromstring(view_arch_utf8)
@@ -527,7 +527,7 @@ class view(osv.osv):
 
         # arch and model fields are always returned
         if fields:
-            fields = list(set(fields) | set(['arch', 'model']))
+            fields = list({'arch', 'model'}.union(fields))
 
         # read the view arch
         [view] = self.read(cr, uid, [root_id], fields=fields, context=context)