diff --git a/doc/scripts/header.js b/doc/scripts/header.js
index 1c9ad44..437b2b6 100644
--- a/doc/scripts/header.js
+++ b/doc/scripts/header.js
@@ -13,7 +13,7 @@ domReady(function () {
 	projectname.text = 'trie-data-structure/uncompressed-trie';
 	projectname.href = './index.html';
 
-	const header = document.querySelectorAll('header')[0];
+	const header = document.querySelector('header');
 	header.insertBefore(projectname, header.firstChild);
 
 	const testlink = document.querySelector('header > a[data-ice="testLink"]');