diff --git a/addons/mail/static/src/js/client_action.js b/addons/mail/static/src/js/client_action.js
index 13b6849f043..8d4222f5a5e 100644
--- a/addons/mail/static/src/js/client_action.js
+++ b/addons/mail/static/src/js/client_action.js
@@ -647,7 +647,6 @@ var ChatAction = Widget.extend(ControlPanelMixin, {
             target: 'current'
         });
     },
-            context: "{'default_no_auto_thread': False}",
 });