diff --git a/trytond/ir/ui/view.py b/trytond/ir/ui/view.py
index 6a9bf270f0..0482ea82a5 100644
--- a/trytond/ir/ui/view.py
+++ b/trytond/ir/ui/view.py
@@ -15,6 +15,7 @@ class View(OSV):
     model = fields.Char('Model', required=True, select=1)
     priority = fields.Integer('Priority', required=True, select=1)
     type = fields.Selection([
+        (False, ''),
        ('tree','Tree'),
        ('form','Form'),
        ('graph', 'Graph'),