diff --git a/app/serializers/pbs/mailing_list_subscriber_serializer.rb b/app/serializers/pbs/mailing_list_subscriber_serializer.rb
index a4575e9cf..2dec3f028 100644
--- a/app/serializers/pbs/mailing_list_subscriber_serializer.rb
+++ b/app/serializers/pbs/mailing_list_subscriber_serializer.rb
@@ -10,8 +10,9 @@ module Pbs::MailingListSubscriberSerializer
 
   included do
     schema do
-      # TBD: keep this fields name?
+      # correspondence_language is deprecated and could be removed in the future
       property :correspondence_language, item.language
+      property :language, item.language
       property :kantonalverband_short_name, item.kantonalverband.short_name
     end
   end
diff --git a/app/serializers/pbs/person_serializer.rb b/app/serializers/pbs/person_serializer.rb
index e55c9c109..d77f703fe 100644
--- a/app/serializers/pbs/person_serializer.rb
+++ b/app/serializers/pbs/person_serializer.rb
@@ -10,10 +10,12 @@ module Pbs::PersonSerializer
 
   included do
     extension(:details) do |_|
-      # TBD: keep fields name?
       map_properties :pbs_number, :salutation_value, :language,
                      :prefers_digital_correspondence, :grade_of_school, :brother_and_sisters,
                      :entry_date, :leaving_date
+
+      # correspondence_language is deprecated and could be removed in the future
+      property :correspondence_language, item.language
     end
   end