diff --git a/src/pretix/base/services/quotas.py b/src/pretix/base/services/quotas.py
index 0a805df4e..9dd78231d 100644
--- a/src/pretix/base/services/quotas.py
+++ b/src/pretix/base/services/quotas.py
@@ -440,6 +440,5 @@ def refresh_quota_caches():
 
         for qs in grouper(quotas, 100, None):
             qa = QuotaAvailability(early_out=False)
-            for q in qs:
-                qa.queue([q for q in qs if q is not None])
+            qa.queue(*[q for q in qs if q is not None])
             qa.compute()