diff --git a/openerp/addons/base/res/res_users.py b/openerp/addons/base/res/res_users.py
index acd3a3c19ca..898a100a2cf 100644
--- a/openerp/addons/base/res/res_users.py
+++ b/openerp/addons/base/res/res_users.py
@@ -873,7 +873,7 @@ class users_view(osv.osv):
                 res[name_selection_groups(map(int, gs))] = {
                     'type': 'selection',
                     'string': app and app.name or _('Other'),
-                    'selection': [(g.id, g.name) for g in gs],
+                    'selection': [(False, '')] + [(g.id, g.name) for g in gs],
                     'help': '\n'.join(tips),
                 }
             else: