diff --git a/app/celery/tasks.py b/app/celery/tasks.py
index a7ca9665c..464e3e1be 100644
--- a/app/celery/tasks.py
+++ b/app/celery/tasks.py
@@ -321,7 +321,8 @@ def create_dvla_file_contents(job_id):
             notification.template.__dict__,
             notification.personalisation,
             notification_reference=notification.reference,
-            contact_block=notification.service.letter_contact_block
+            contact_block=notification.service.letter_contact_block,
+            org_id=notification.service.dvla_organisation.id,
         ))
         for notification in dao_get_all_notifications_for_job(job_id)
     )
diff --git a/tests/app/celery/test_tasks.py b/tests/app/celery/test_tasks.py
index 0a960329b..15d7e571b 100644
--- a/tests/app/celery/test_tasks.py
+++ b/tests/app/celery/test_tasks.py
@@ -1038,6 +1038,7 @@ def test_create_dvla_file_contents(sample_letter_template, mocker):
     assert calls[1][1]['contact_block'] == 'London,\nSW1A 1AA'
     assert calls[0][1]['notification_reference'] == '1'
     assert calls[1][1]['notification_reference'] == '2'
+    assert calls[1][1]['org_id'] == '001'
 
 
 @freeze_time("2017-03-23 11:09:00.061258")