diff --git a/frigate/record/cleanup.py b/frigate/record/cleanup.py
index be7aa5aab..c2c7d32e7 100644
--- a/frigate/record/cleanup.py
+++ b/frigate/record/cleanup.py
@@ -128,6 +128,7 @@ class RecordingCleanup(threading.Thread):
             )
             .order_by(Previews.start_time)
             .namedtuples()
+            .iterator()
         )
 
         # expire previews