diff --git a/src/pretix/base/models/orders.py b/src/pretix/base/models/orders.py
index 3d2e253f69..c2f2062fa6 100644
--- a/src/pretix/base/models/orders.py
+++ b/src/pretix/base/models/orders.py
@@ -985,7 +985,7 @@ class Order(LockModel, LoggedModel):
                   context: Dict[str, Any]=None, log_entry_type: str='pretix.event.order.email.sent',
                   user: User=None, headers: dict=None, sender: str=None, invoices: list=None,
                   auth=None, attach_tickets=False, position: 'OrderPosition'=None, auto_email=True,
-                  attach_ical=False, attach_other_files: list=None):
+                  attach_ical=False, attach_cached_files: list=None, attach_other_files: list=None):
         """
         Sends an email to the user that placed this order. Basically, this method does two things:
 
@@ -1030,7 +1030,7 @@ class Order(LockModel, LoggedModel):
                     self.event, self.locale, self, headers=headers, sender=sender,
                     invoices=invoices, attach_tickets=attach_tickets,
                     position=position, auto_email=auto_email, attach_ical=attach_ical,
-                    attach_other_files=attach_other_files,
+                    attach_other_files=attach_other_files, attach_cached_files=attach_cached_files,
                 )
             except SendMailException:
                 raise