diff --git a/addons/account/account_move_line.py b/addons/account/account_move_line.py
index 79a846c8ad7..3e4d4c184d2 100644
--- a/addons/account/account_move_line.py
+++ b/addons/account/account_move_line.py
@@ -459,7 +459,7 @@ class account_move_line(osv.osv):
         'analytic_account_id': fields.many2one('account.analytic.account', 'Analytic Account'),
         #TODO: remove this
         #'amount_taxed':fields.float("Taxed Amount", digits_compute=dp.get_precision('Account')),
-        'company_id': fields.related('account_id', 'company_id', type='many2one', relation='res.company', string='Company', store=True)
+        'company_id': fields.related('account_id', 'company_id', type='many2one', relation='res.company', string='Company', store=True, readonly=True)
 
     }