diff --git a/public/css/widget/custom-var-table.less b/public/css/widget/custom-var-table.less
index cc702dc4..46f1984d 100644
--- a/public/css/widget/custom-var-table.less
+++ b/public/css/widget/custom-var-table.less
@@ -37,7 +37,8 @@
     }
   }
 
-  &.can-collapse thead th > span {
+  &.can-collapse thead th > span, // Icinga Web 2 < 2.12
+  &[data-can-collapse] thead th > span { // >= 2.12
     :nth-child(1) {
       display: none;
     }