diff --git a/src/pretix/base/services/orders.py b/src/pretix/base/services/orders.py
index 9ae2ab6a6..75f5b76be 100644
--- a/src/pretix/base/services/orders.py
+++ b/src/pretix/base/services/orders.py
@@ -384,7 +384,7 @@ def send_expiry_warnings(sender, **kwargs):
             eventcache[o.event.pk] = settings
 
         days = settings.get('mail_days_order_expire_warning', as_type=int)
-        if days and (o.expires.date() - today).days <= days:
+        if days and (o.expires - today).days <= days:
             o.expiry_reminder_sent = True
             o.save()
             try: