diff --git a/src/pretix/base/migrations/0308_checkoutsession_invoiceaddress_checkout_session.py b/src/pretix/base/migrations/0308_checkoutsession_invoiceaddress_checkout_session.py
index b1230d4376..3a644e032d 100644
--- a/src/pretix/base/migrations/0308_checkoutsession_invoiceaddress_checkout_session.py
+++ b/src/pretix/base/migrations/0308_checkoutsession_invoiceaddress_checkout_session.py
@@ -37,6 +37,7 @@ class Migration(migrations.Migration):
                     "event",
                     models.ForeignKey(
                         on_delete=django.db.models.deletion.CASCADE,
+                        related_name="checkout_sessions",
                         to="pretixbase.event",
                     ),
                 ),