diff --git a/addons/mail/static/src/components/chatter_topbar/chatter_topbar.scss b/addons/mail/static/src/components/chatter_topbar/chatter_topbar.scss
index 72431aad60e..b4000c8a65e 100644
--- a/addons/mail/static/src/components/chatter_topbar/chatter_topbar.scss
+++ b/addons/mail/static/src/components/chatter_topbar/chatter_topbar.scss
@@ -6,6 +6,11 @@
     display: flex;
     flex-direction: row;
     justify-content: space-between;
+    // We need the +1 to handle the status bar border-bottom.
+    // The var is called `$o-statusbar-height`, but is used on button, therefore
+    // doesn't include the border-bottom.
+    // We use min-height to allow multiples buttons lines on mobile.
+    min-height: $o-statusbar-height + 1;
 }
 
 .o_ChatterTopbar_actions {