diff --git a/addons/mail/static/src/js/chat_manager.js b/addons/mail/static/src/js/chat_manager.js
index 54eaf637ff8..78f5547e6c8 100644
--- a/addons/mail/static/src/js/chat_manager.js
+++ b/addons/mail/static/src/js/chat_manager.js
@@ -459,7 +459,7 @@ function fetch_document_messages (ids, options) {
                 processed_msgs.push(add_message(msg, {silent: true}));
             });
             return _.sortBy(loaded_msgs.concat(processed_msgs), function (msg) {
-                return msg.date;
+                return msg.id;
             });
         });
     } else {