diff --git a/src/pretix/base/services/orders.py b/src/pretix/base/services/orders.py
index 4fd37306a..a1664519b 100644
--- a/src/pretix/base/services/orders.py
+++ b/src/pretix/base/services/orders.py
@@ -1380,7 +1380,9 @@ def send_download_reminders(sender, **kwargs):
         download_reminder_sent=False,
         datetime__lte=now() - timedelta(hours=2),
         first_date__gte=today,
-    ).only('pk', 'event_id', 'sales_channel').order_by('event_id')
+    ).only(
+        'pk', 'event_id', 'sales_channel', 'datetime',
+    ).order_by('event_id')
     event_id = None
     days = None
     event = None