diff --git a/addons/mail/static/src/core/common/discuss.xml b/addons/mail/static/src/core/common/discuss.xml
index 5de23cb70f8..56c9092966e 100644
--- a/addons/mail/static/src/core/common/discuss.xml
+++ b/addons/mail/static/src/core/common/discuss.xml
@@ -75,7 +75,7 @@
 </t>
 
 <t t-name="mail.Discuss.mobileTopbar" owl="1">
-    <div class="d-flex w-100 ">
+    <div class="btn-group d-flex w-100 p-1">
         <t t-call="mail.MobileMailbox" >
             <t t-set="mailbox" t-value="store.discuss.inbox"/>
         </t>