diff --git a/addons/account/account_invoice.py b/addons/account/account_invoice.py
index f2e3e35e047..8f7c0fd65b5 100644
--- a/addons/account/account_invoice.py
+++ b/addons/account/account_invoice.py
@@ -289,7 +289,7 @@ class account_invoice(osv.osv):
         'user_id': lambda s, cr, u, c: u,
     }
     _sql_constraints = [
-        ('number_uniq', 'unique(number, company_id)', 'Invoice Number must be unique per Company!'),
+        ('number_uniq', 'unique(number, company_id, journal_id, type)', 'Invoice Number must be unique per Company!'),
     ]
 
     def fields_view_get(self, cr, uid, view_id=None, view_type=False, context=None, toolbar=False, submenu=False):