diff --git a/addons/event_sale/models/account_invoice.py b/addons/event_sale/models/account_invoice.py
index b8f4e309bb4b1985e9d1e13f3446ddb22d061d23..df995d576f5b6c798fb87e7a7b859e02a7b3e3cf 100644
--- a/addons/event_sale/models/account_invoice.py
+++ b/addons/event_sale/models/account_invoice.py
@@ -9,7 +9,7 @@ class AccountInvoice(models.Model):
 
     @api.multi
     def action_invoice_paid(self):
-    	""" When an invoice linked to a sales order selling registrations is
+        """ When an invoice linked to a sales order selling registrations is
         paid confirm attendees. Attendees should indeed not be confirmed before
         full payment. """
         res = super(AccountInvoice, self).action_invoice_paid()