diff --git a/addons/mail/static/src/models/message_list_view_message_view_item.js b/addons/mail/static/src/models/message_list_view_message_view_item.js
index 758d5c5cdfc..9ed502b8c71 100644
--- a/addons/mail/static/src/models/message_list_view_message_view_item.js
+++ b/addons/mail/static/src/models/message_list_view_message_view_item.js
@@ -13,7 +13,6 @@ registerModel({
     identifyingFields: ['messageListViewOwner', 'message'],
     fields: {
         isSquashed: attr({
-            readonly: true,
             required: true,
         }),
         message: one('Message', {