diff --git a/addons/mail/static/src/public/discuss_public_boot.js b/addons/mail/static/src/public/discuss_public_boot.js
index 31b9c21c2b7..acd5cb1e73a 100644
--- a/addons/mail/static/src/public/discuss_public_boot.js
+++ b/addons/mail/static/src/public/discuss_public_boot.js
@@ -75,6 +75,7 @@ export async function boot() {
             composerAttachmentsDetailsMode: 'card',
             hasComposer: true,
             hasComposerThreadTyping: true,
+            hasSquashCloseMessages: true,
             threadViewLocalId: threadViewer.threadView.localId,
         });
         await threadViewComponent.mount(document.body);