diff --git a/src/theme.js b/src/theme.js
index 530827e8a..2f0133428 100644
--- a/src/theme.js
+++ b/src/theme.js
@@ -146,13 +146,10 @@ function ThemeNav () {
             if (link.length > 0) {
                 $('.wy-menu-vertical .current').removeClass('current');
                 link.addClass('current');
-                link.closest('li.toctree-l1').addClass('current');
                 link.closest('li.toctree-l1').parent().addClass('current');
-                link.closest('li.toctree-l1').addClass('current');
-                link.closest('li.toctree-l2').addClass('current');
-                link.closest('li.toctree-l3').addClass('current');
-                link.closest('li.toctree-l4').addClass('current');
-                link.closest('li.toctree-l5').addClass('current');
+                for (let i = 1; i <= 10; i++) {
+                    link.closest('li.toctree-l' + i).addClass('current');
+                }
                 link[0].scrollIntoView();
             }
         }