diff --git a/packages/django-dramatiq-postgres/django_dramatiq_postgres/broker.py b/packages/django-dramatiq-postgres/django_dramatiq_postgres/broker.py
index 35aa8cd7ff..5c283610a1 100644
--- a/packages/django-dramatiq-postgres/django_dramatiq_postgres/broker.py
+++ b/packages/django-dramatiq-postgres/django_dramatiq_postgres/broker.py
@@ -465,7 +465,7 @@ class _PostgresConsumer(Consumer):
         self.logger.debug("Running garbage collector")
         count = self.query_set.filter(
             state__in=(TaskState.DONE, TaskState.REJECTED),
-            mtime__lte=timezone.now() - timedelta(seconds=Conf().task_purge_interval),
+            mtime__lte=timezone.now() - timedelta(seconds=Conf().task_expiration),
             result_expiry__lte=timezone.now(),
         ).delete()
         self.logger.info("Purged messages in all queues", count=count)