diff --git a/src/zen/tabs/zen-tabs/vertical-tabs-topbar.inc.css b/src/zen/tabs/zen-tabs/vertical-tabs-topbar.inc.css
index bb56de93c..ac882b445 100644
--- a/src/zen/tabs/zen-tabs/vertical-tabs-topbar.inc.css
+++ b/src/zen/tabs/zen-tabs/vertical-tabs-topbar.inc.css
@@ -35,6 +35,11 @@ z-index: 1;
       opacity: 0;
       pointer-events: none;
     }
+
+    & .titlebar-button {
+      padding-top: 0 !important;
+      padding-bottom: 0 !important;
+    }
   }
 
   @media -moz-pref('zen.view.experimental-no-window-controls') {