diff --git a/doc/development/api/general.rst b/doc/development/api/general.rst
index 5b1d13609..b9712fe9b 100644
--- a/doc/development/api/general.rst
+++ b/doc/development/api/general.rst
@@ -58,7 +58,7 @@ Backend
 .. automodule:: pretix.control.signals
    :members: nav_event, html_head, html_page_start, quota_detail_html, nav_topbar, nav_global, nav_organizer, nav_event_settings,
              order_info, event_settings_widget, oauth_application_registered, order_position_buttons, subevent_forms,
-             item_formsets, order_search_filter_q
+             item_formsets, order_search_filter_q, order_search_forms
 
 .. automodule:: pretix.base.signals
    :members: logentry_display, logentry_object_link, requiredaction_display, timeline_events
diff --git a/src/pretix/control/forms/filter.py b/src/pretix/control/forms/filter.py
index 2ff15c6b3..1145ab912 100644
--- a/src/pretix/control/forms/filter.py
+++ b/src/pretix/control/forms/filter.py
@@ -452,9 +452,6 @@ class EventOrderExpertFilterForm(EventOrderFilterForm):
     sales_channel = forms.ChoiceField(
         label=_('Sales channel'),
         required=False,
-        choices=[('', '')] + [
-            (k, v.verbose_name) for k, v in get_all_sales_channels().items()
-        ]
     )
 
     def __init__(self, *args, **kwargs):
@@ -467,6 +464,10 @@ class EventOrderExpertFilterForm(EventOrderFilterForm):
             del self.fields['subevents_from']
             del self.fields['subevents_to']
 
+        self.fields['sales_channel'].choices = [('', '')] + [
+            (k, v.verbose_name) for k, v in get_all_sales_channels().items()
+        ]
+
         locale_names = dict(settings.LANGUAGES)
         self.fields['locale'].choices = [('', '')] + [(a, locale_names[a]) for a in self.event.settings.locales]