diff --git a/doc/scripts/header.js b/doc/scripts/header.js
index 7671415..b842b06 100644
--- a/doc/scripts/header.js
+++ b/doc/scripts/header.js
@@ -13,7 +13,7 @@ domReady(() => {
 	projectname.text = '@union-find/non-contiguous';
 	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"]');