diff --git a/app/celery/research_mode_tasks.py b/app/celery/research_mode_tasks.py
index ea9099509..0e0586466 100644
--- a/app/celery/research_mode_tasks.py
+++ b/app/celery/research_mode_tasks.py
@@ -122,7 +122,7 @@ def firetext_callback(notification_id, to):
 @notify_celery.task(bind=True, name="create-fake-letter-response-file", max_retries=5, default_retry_delay=300)
 def create_fake_letter_response_file(self, reference):
     now = datetime.utcnow()
-    dvla_response_data = '{}|Sent|1|Sorted'.format(reference)
+    dvla_response_data = '{}|Sent|0|Sorted'.format(reference)
     upload_file_name = 'NOTIFY.{}.RSP.TXT'.format(now.strftime('%Y%m%d%H%M%S'))
 
     s3upload(
diff --git a/tests/app/celery/test_research_mode_tasks.py b/tests/app/celery/test_research_mode_tasks.py
index 819e9a399..7c1b7d1f3 100644
--- a/tests/app/celery/test_research_mode_tasks.py
+++ b/tests/app/celery/test_research_mode_tasks.py
@@ -124,7 +124,7 @@ def test_create_fake_letter_response_file_uploads_response_file_s3(
         create_fake_letter_response_file('random-ref')
 
         mock_s3upload.assert_called_once_with(
-            filedata='random-ref|Sent|1|Sorted',
+            filedata='random-ref|Sent|0|Sorted',
             region=current_app.config['AWS_REGION'],
             bucket_name=current_app.config['DVLA_RESPONSE_BUCKET_NAME'],
             file_location=filename