diff --git a/openerp/addons/base/res/res_bank.py b/openerp/addons/base/res/res_bank.py
index 0acdbe100bb..f262c18d47b 100644
--- a/openerp/addons/base/res/res_bank.py
+++ b/openerp/addons/base/res/res_bank.py
@@ -67,7 +67,7 @@ class ResPartnerBank(models.Model):
     company_id = fields.Many2one('res.company', 'Company', default=lambda self: self.env.user.company_id, ondelete='cascade')
 
     _sql_constraints = [
-        ('unique_number', 'unique(sanitized_acc_number)', 'Account Number must be unique'),
+        ('unique_number', 'unique(sanitized_acc_number, company_id)', 'Account Number must be unique'),
     ]
 
     @api.one