diff --git a/app/celery/scheduled_tasks.py b/app/celery/scheduled_tasks.py
index 5cc35f257..16fcf0d4f 100644
--- a/app/celery/scheduled_tasks.py
+++ b/app/celery/scheduled_tasks.py
@@ -311,7 +311,7 @@ def run_letter_jobs():
     job_ids = [job.id for job in dao_get_letter_jobs_by_status(JOB_STATUS_READY_TO_SEND)]
     notify_celery.send_task(
         name=TaskNames.DVLA_FILES,
-        args=(job_ids),
+        args=(job_ids,),
         queue=QueueNames.PROCESS_FTP
     )
     current_app.logger.info("Queued {} ready letter job ids onto {}".format(len(job_ids), QueueNames.PROCESS_FTP))
diff --git a/tests/app/celery/test_scheduled_tasks.py b/tests/app/celery/test_scheduled_tasks.py
index 78d46a54b..cc638c01b 100644
--- a/tests/app/celery/test_scheduled_tasks.py
+++ b/tests/app/celery/test_scheduled_tasks.py
@@ -696,5 +696,5 @@ def test_run_letter_jobs(client, mocker, sample_letter_template):
     run_letter_jobs()
 
     mock_celery.assert_called_once_with(name=TaskNames.DVLA_FILES,
-                                        args=([job.id for job in jobs]),
+                                        args=([job.id for job in jobs],),
                                         queue=QueueNames.PROCESS_FTP)