diff --git a/website_event_compassion/models/event_registration.py b/website_event_compassion/models/event_registration.py
index 73400ca..859c479 100644
--- a/website_event_compassion/models/event_registration.py
+++ b/website_event_compassion/models/event_registration.py
@@ -668,6 +668,7 @@ def create_trip_invoice(self):
                         "invoice_line_ids": invoice_lines,
                     }
                 )
+                registration.trip_invoice_id.action_post()
         return True
 
     ##########################################################################