diff --git a/lib/serializers/registrant_api/domain.rb b/lib/serializers/registrant_api/domain.rb
index 9559a70ad..542f2d0de 100644
--- a/lib/serializers/registrant_api/domain.rb
+++ b/lib/serializers/registrant_api/domain.rb
@@ -43,7 +43,7 @@ module Serializers
           status_notes: domain.status_notes,
           nameservers: nameservers,
           dnssec_keys: dnssec_keys,
-          dnssec_changed_at: dnssec_updated_at
+          dnssec_changed_at: dnssec_updated_at,
         }
       end