diff --git a/src/pretix/api/views/order.py b/src/pretix/api/views/order.py
index dbc6925a3..29a9d85ea 100644
--- a/src/pretix/api/views/order.py
+++ b/src/pretix/api/views/order.py
@@ -21,7 +21,8 @@ from pretix.base.models.organizer import TeamAPIToken
 from pretix.base.services.invoices import invoice_pdf
 from pretix.base.services.mail import SendMailException
 from pretix.base.services.orders import (
-    OrderError, cancel_order, extend_order, mark_order_expired, mark_order_paid,
+    OrderError, cancel_order, extend_order, mark_order_expired,
+    mark_order_paid,
 )
 from pretix.base.services.tickets import (
     get_cachedticket_for_order, get_cachedticket_for_position,
diff --git a/src/pretix/control/urls.py b/src/pretix/control/urls.py
index cfa42f0ec..77fc34053 100644
--- a/src/pretix/control/urls.py
+++ b/src/pretix/control/urls.py
@@ -2,7 +2,8 @@ from django.conf.urls import include, url
 
 from pretix.control.views import (
     auth, checkin, dashboards, event, global_settings, item, main, orders,
-    organizer, search, subevents, typeahead, user, users, vouchers, waitinglist,
+    organizer, search, subevents, typeahead, user, users, vouchers,
+    waitinglist,
 )
 
 urlpatterns = [
diff --git a/src/pretix/presale/views/checkout.py b/src/pretix/presale/views/checkout.py
index 1cde39a99..1295dd888 100644
--- a/src/pretix/presale/views/checkout.py
+++ b/src/pretix/presale/views/checkout.py
@@ -10,7 +10,8 @@ from pretix.base.signals import validate_cart
 from pretix.multidomain.urlreverse import eventreverse
 from pretix.presale.checkoutflow import get_checkout_flow
 from pretix.presale.views import (
-    allow_frame_if_namespaced, cart_exists, get_cart, iframe_entry_view_wrapper,
+    allow_frame_if_namespaced, cart_exists, get_cart,
+    iframe_entry_view_wrapper,
 )