diff --git a/static/js/message_store.js b/static/js/message_store.js
index c50914516f..17cf8a397b 100644
--- a/static/js/message_store.js
+++ b/static/js/message_store.js
@@ -179,7 +179,7 @@ exports.add_message_metadata = function (message) {
 
         if (people.is_my_user_id(message.sender_id)) {
             _.each(message.display_recipient, (recip) => {
-                message_user_ids.add(recip.id || recip.user_id);
+                message_user_ids.add(recip.id);
             });
         }
         break;