diff --git a/src/pretix/api/serializers/event.py b/src/pretix/api/serializers/event.py
index fce2793771..8793d07627 100644
--- a/src/pretix/api/serializers/event.py
+++ b/src/pretix/api/serializers/event.py
@@ -704,6 +704,7 @@ class EventSettingsSerializer(SettingsSerializer):
         'payment_term_accept_late',
         'payment_explanation',
         'payment_pending_hidden',
+        'mail_days_order_expire_warning',
         'ticket_download',
         'ticket_download_date',
         'ticket_download_addons',
diff --git a/src/pretix/base/settings.py b/src/pretix/base/settings.py
index 9665fd3359..b0abbef8bb 100644
--- a/src/pretix/base/settings.py
+++ b/src/pretix/base/settings.py
@@ -1709,6 +1709,17 @@ Best regards,
 Your {event} team"""))
     },
     'mail_days_order_expire_warning': {
+        'form_class': forms.IntegerField,
+        'serializer_class': serializers.IntegerField,
+        'serializer_kwargs': dict(
+            min_value=0,
+        ),
+        'form_kwargs': dict(
+            label=_("Number of days"),
+            min_value=0,
+            help_text=_("This email will be sent out this many days before the order expires. If the "
+                        "value is 0, the mail will never be sent.")
+        ),
         'type': int,
         'default': '3'
     },