diff --git a/addons/sale/controllers/portal.py b/addons/sale/controllers/portal.py
index 868235fde64..01a43a9f07a 100644
--- a/addons/sale/controllers/portal.py
+++ b/addons/sale/controllers/portal.py
@@ -224,6 +224,7 @@ class CustomerPortal(CustomerPortal):
                 'signed_on': fields.Datetime.now(),
                 'signature': signature,
             })
+            request.env.cr.commit()
         except (TypeError, binascii.Error) as e:
             return {'error': _('Invalid signature data.')}