diff --git a/themes/DeepThought/static/js/site.js b/themes/DeepThought/static/js/site.js
index bc0fca2..cc195c0 100644
--- a/themes/DeepThought/static/js/site.js
+++ b/themes/DeepThought/static/js/site.js
@@ -22,7 +22,8 @@
   }
 
   function activateIfVisible() {
-    for (b = true, i = 0; i < tocItems.length; i++) {
+     let b = true;
+     for (let i = 0; i < tocItems.length; i++) {
       if (b && isVisible(i)) {
         tocItems[i].classList.add('is-active');
         b = false;