diff --git a/trytond/res/user.py b/trytond/res/user.py
index d803350241..3f75f30c1e 100644
--- a/trytond/res/user.py
+++ b/trytond/res/user.py
@@ -47,7 +47,7 @@ class User(OSV):
         'active': fields.Boolean('Active'),
         'action': fields.Many2One('ir.action', 'Home Action'),
         'menu': fields.Many2One('ir.action', 'Menu Action'),
-        'groups_id': fields.Many2Many('res.group', 'res_group_user_rel',
+        'groups': fields.Many2Many('res.group', 'res_group_user_rel',
             'uid', 'gid', 'Groups'),
         'rule_groups': fields.Many2Many('ir.rule.group', 'user_rule_group_rel',
             'user_id', 'rule_group_id', 'Rules',
@@ -75,6 +75,7 @@ class User(OSV):
     _context_fields = [
         'language',
         'timezone',
+        'groups',
     ]
 
     def __init__(self, pool):
@@ -157,12 +158,12 @@ class User(OSV):
         return res
 
     def set_preferences(self, cursor, user, values, context=None):
-        values = values.copy()
+        values_clean = values.copy()
         fields = self._preferences_fields + self._context_fields
         for field in values:
-            if field not in fields:
-                del values[field]
-        self.write(cursor, 1, user, values, context=context)
+            if field not in fields or field == 'groups':
+                del values_clean[field]
+        self.write(cursor, 1, user, values_clean, context=context)
 
     def get_preferences_fields_view(self, cursor, user, context=None):
         res = {}
@@ -179,7 +180,10 @@ class User(OSV):
         arch, fields = self._view_look_dom_arch(cursor,
                 user, doc, context=context)
         for field in fields:
-            fields[field]['readonly'] = False
+            if field not in ('groups'):
+                fields[field]['readonly'] = False
+            else:
+                fields[field]['readonly'] = True
         res['arch'] = arch
         res['fields'] = fields
         return res
diff --git a/trytond/res/user.xml b/trytond/res/user.xml
index 2f6b72fc64..16369c5afa 100644
--- a/trytond/res/user.xml
+++ b/trytond/res/user.xml
@@ -11,7 +11,7 @@
             <field name="signature">Administrator</field>
             <field name="action" ref="ir.act_menu_tree"/>
             <field name="menu" ref="ir.act_menu_tree"/>
-            <field name="groups_id" eval="[(6, 0, [ref('group_admin')])]"/>
+            <field name="groups" eval="[(6, 0, [ref('group_admin')])]"/>
         </record>
         <record model="ir.ui.view" id="user_view_form">
             <field name="model">res.user</field>
@@ -40,8 +40,8 @@
                             <field name="signature" colspan="4"/>
                         </page>
                         <page string="Security" col="1">
-                            <separator name="groups_id"/>
-                            <field name="groups_id"/>
+                            <separator name="groups"/>
+                            <field name="groups"/>
                             <separator name="roles_id"/>
                             <field name="roles_id"/>
                             <separator name="rule_groups"/>
diff --git a/trytond/wkf_service/wkf_expr.py b/trytond/wkf_service/wkf_expr.py
index 8a8b4babc5..b8aa4dfca8 100644
--- a/trytond/wkf_service/wkf_expr.py
+++ b/trytond/wkf_service/wkf_expr.py
@@ -66,7 +66,7 @@ def check(cursor, ident, transition, signal):
         user = ident[0]
         serv = netsvc.LocalService('object_proxy')
         user_groups = serv.execute_cr(cursor, user, 'res.user', 'read', user,
-                ['groups_id'])['groups_id']
+                ['groups'])['groups']
         res = transition['group'] in user_groups
     res = res and eval_expr(cursor, ident, transition['condition'])
     return res