diff --git a/addons/mail/static/src/less/thread.less b/addons/mail/static/src/less/thread.less
index f2971dcf17e..e523e6ffe2d 100644
--- a/addons/mail/static/src/less/thread.less
+++ b/addons/mail/static/src/less/thread.less
@@ -111,6 +111,10 @@
                 color: gray;
             }
 
+            [summary~=o_mail_notification] { // name conflicts with channel notifications, but is odoo notification buttons to hide in chatter if present
+                display: none;
+            }
+
             > p {
                 margin: 0 0 9px; // Required by the old design to override a general rule on p's
                 &:last-child {