diff --git a/manifest-delivery-base.yml b/manifest-delivery-base.yml
index 8838ad40b..26a12ea0e 100644
--- a/manifest-delivery-base.yml
+++ b/manifest-delivery-base.yml
@@ -51,7 +51,7 @@ applications:
       NOTIFY_APP_NAME: delivery-worker-priority
 
   - name: notify-delivery-worker
-    command: scripts/run_app_paas.sh celery -A run_celery.notify_celery worker --loglevel=INFO --concurrency=11 -Q job-tasks,retry-tasks,notify-internal-tasks,create-letters-pdf-tasks
+    command: scripts/run_app_paas.sh celery -A run_celery.notify_celery worker --loglevel=INFO --concurrency=11 -Q job-tasks,retry-tasks,notify-internal-tasks,create-letters-pdf-tasks,letter-tasks
     env:
       NOTIFY_APP_NAME: delivery-worker
 
diff --git a/tests/app/test_config.py b/tests/app/test_config.py
index 2f643ba5c..4e17390de 100644
--- a/tests/app/test_config.py
+++ b/tests/app/test_config.py
@@ -63,7 +63,7 @@ def test_cloudfoundry_config_has_different_defaults():
 def test_queue_names_all_queues_correct():
     # Need to ensure that all_queues() only returns queue names used in API
     queues = QueueNames.all_queues()
-    assert len(queues) == 12
+    assert len(queues) == 13
     assert set([
         QueueNames.PRIORITY,
         QueueNames.PERIODIC,
@@ -76,5 +76,6 @@ def test_queue_names_all_queues_correct():
         QueueNames.RETRY,
         QueueNames.NOTIFY,
         QueueNames.CREATE_LETTERS_PDF,
-        QueueNames.CALLBACKS
+        QueueNames.CALLBACKS,
+        QueueNames.LETTERS,
     ]) == set(queues)