diff --git a/public/css/icinga/compat.less b/public/css/icinga/compat.less
index 95f7c2772..d57a18945 100644
--- a/public/css/icinga/compat.less
+++ b/public/css/icinga/compat.less
@@ -24,6 +24,7 @@
 @colorFormNotificationWarning: #ffaa44;
 @colorFormNotificationError: #ff5566;
 @colorPetrol: @icinga-blue;
+@menu-2ndlvl-highlight-color: @menu-2ndlvl-active-color;
 
 table.action {
   .common-table();