diff --git a/src/pretix/base/models/event.py b/src/pretix/base/models/event.py
index c54fe4089..e13c8be10 100644
--- a/src/pretix/base/models/event.py
+++ b/src/pretix/base/models/event.py
@@ -717,7 +717,6 @@ class Event(EventMixin, LoggedModel):
         self.settings.low_availability_percentage = 10
         self.settings.mail_send_order_free_attendee = True
         self.settings.mail_send_order_placed_attendee = True
-        self.settings.mail_send_order_placed_attendee = True
         self.settings.mail_send_order_paid_attendee = True
         self.settings.mail_send_order_approved_attendee = True
         self.settings.mail_send_order_approved_free_attendee = True