diff --git a/addons/event_sale/models/sale_order.py b/addons/event_sale/models/sale_order.py
index b749f615293..1b15093de03 100644
--- a/addons/event_sale/models/sale_order.py
+++ b/addons/event_sale/models/sale_order.py
@@ -12,8 +12,16 @@ class SaleOrder(models.Model):
         for so in self:
             # confirm registration if it was free (otherwise it will be confirmed once invoice fully paid)
             so.order_line._update_registrations(confirm=so.amount_total == 0, cancel_to_draft=False)
+        return res
+
+    @api.multi
+    def action_confirm(self):
+        res = super(SaleOrder, self).action_confirm()
+        for so in self:
             if any(so.order_line.filtered(lambda line: line.event_id)):
-                return self.env['ir.actions.act_window'].with_context(default_sale_order_id=so.id).for_xml_id('event_sale', 'action_sale_order_event_registration')
+                return self.env['ir.actions.act_window'] \
+                    .with_context(default_sale_order_id=so.id) \
+                    .for_xml_id('event_sale', 'action_sale_order_event_registration')
         return res