diff --git a/openerp/addons/base/module/module.py b/openerp/addons/base/module/module.py
index 1eb96c3735b..beb35ee38b2 100644
--- a/openerp/addons/base/module/module.py
+++ b/openerp/addons/base/module/module.py
@@ -205,7 +205,7 @@ class module(osv.osv):
             ('to remove','To be removed'),
             ('to install','To be installed')
         ], string='State', readonly=True, select=True),
-        'demo': fields.boolean('Demo data'),
+        'demo': fields.boolean('Demo data', readonly=True),
         'license': fields.selection([
                 ('GPL-2', 'GPL Version 2'),
                 ('GPL-2 or any later version', 'GPL-2 or later version'),