diff --git a/src/pretix/base/services/invoices.py b/src/pretix/base/services/invoices.py
index 266a8d63b..8fe27d9b7 100644
--- a/src/pretix/base/services/invoices.py
+++ b/src/pretix/base/services/invoices.py
@@ -671,6 +671,7 @@ def send_invoices_to_organizer(sender, **kwargs):
                             event=i.event,
                             invoices=[i],
                             auto_email=True,
+                            plain_text_only=True,
                         )
                     i.sent_to_organizer = True
                 else: