diff --git a/lib/submissions/serialize_for_api.rb b/lib/submissions/serialize_for_api.rb
index a2b1b4b1..388a9d8e 100644
--- a/lib/submissions/serialize_for_api.rb
+++ b/lib/submissions/serialize_for_api.rb
@@ -3,7 +3,7 @@
 module Submissions
   module SerializeForApi
     SERIALIZE_PARAMS = {
-      only: %i[id source submitters_order created_at updated_at archived_at],
+      only: %i[id slug source submitters_order created_at updated_at archived_at],
       methods: %i[audit_log_url],
       include: {
         submitters: { only: %i[id slug uuid name email phone