diff --git a/src/pretix/base/services/quotas.py b/src/pretix/base/services/quotas.py
index cec48fd012..eda775fc6f 100644
--- a/src/pretix/base/services/quotas.py
+++ b/src/pretix/base/services/quotas.py
@@ -1,5 +1,3 @@
-from datetime import timedelta
-
 from django.db import models
 from django.db.models import F, Max, OuterRef, Q, Subquery
 from django.dispatch import receiver
@@ -28,7 +26,7 @@ def refresh_quota_cashes():
         last_activity=Subquery(last_activity, output_field=models.DateTimeField())
     ).filter(
         Q(cached_availability_time__isnull=True) |
-        Q(cached_availability_time__lt=F('last_activity') - timedelta(hours=1))
+        Q(cached_availability_time__lt=F('last_activity'))
     )
     for q in quotas:
         q.availability()