diff --git a/src/browser/base/content/zen-styles/zen-tabs/vertical-tabs.css b/src/browser/base/content/zen-styles/zen-tabs/vertical-tabs.css
index 99903c0a3..2ac7eb7d6 100644
--- a/src/browser/base/content/zen-styles/zen-tabs/vertical-tabs.css
+++ b/src/browser/base/content/zen-styles/zen-tabs/vertical-tabs.css
@@ -27,6 +27,9 @@
     padding-top: 0 !important;
 
     --zen-sidebar-action-button-width: 35px;
+    :root[uidensity="compact"] & {
+      --zen-sidebar-action-button-width: 30px;
+    }
 
     & #vertical-tabs-newtab-button {
       background: color-mix(in srgb, var(--button-hover-bgcolor) 40%, transparent 60%);