diff --git a/assets/js/blog.js b/assets/js/blog.js
index 81b81d0d..35d91398 100644
--- a/assets/js/blog.js
+++ b/assets/js/blog.js
@@ -160,11 +160,11 @@ jQuery(function($) {
 
             const HEADERFIX = 120;
             const $toclink = $('.toc-link');
-            const $headerlink = $('.headerlink');
+            const $headerDummyLink = $('.post-dummy-target');
             const $tocLinkLis = $('.post-toc-content li');
             const activeIndex = function () {
                 const scrollTop = $(window).scrollTop();
-                const headerlinkTop = $.map($headerlink, function(link) {
+                const headerlinkTop = $.map($headerDummyLink, function(link) {
                     return $(link).offset().top;
                 });
                 const searchActiveTocIndex = function(array, target) {