diff --git a/chrome/compact_proton.css b/chrome/compact_proton.css
index b438f90..4be0930 100644
--- a/chrome/compact_proton.css
+++ b/chrome/compact_proton.css
@@ -7,7 +7,7 @@ See the above repository for updates as well as full license text. */
   --toolbarbutton-inner-padding: 6px !important;
   --tab-block-margin: 2px !important;
   --tabs-shadow-size: 0px !important;
-  --arrowpanel-menuitem-padding: 5px !important;
+  --arrowpanel-menuitem-padding-block: 5px !important;
   --panel-font-size: inherit !important;
   --arrowpanel-padding: 0.8em !important;
   --inline-tab-padding: 8px !important; /* 8px is default value since it looks good - lower values compactify tabs horizontally */