diff --git a/frontend-js/src/main/js/gui/Legend.js b/frontend-js/src/main/js/gui/Legend.js
index 47d6c5465cdf497891d359d33f673f4a79f29248..ebcaa117926658712cd47d1cd7a9cf3c55597cb9 100644
--- a/frontend-js/src/main/js/gui/Legend.js
+++ b/frontend-js/src/main/js/gui/Legend.js
@@ -74,7 +74,7 @@ Legend.prototype.hide = function () {
 };
 Legend.prototype.show = function () {
   var maxZIndex = Math.max.apply(null,
-    $.map($('body *'), function (e, n) {
+    $.map($('body *'), function (e) {
       if ($(e).css('position') !== 'static') {
         return parseInt($(e).css('z-index')) || 1;
       }