diff --git a/src/Helper/Navigation/Sitemap.php b/src/Helper/Navigation/Sitemap.php
index 76acb227..08aa922e 100644
--- a/src/Helper/Navigation/Sitemap.php
+++ b/src/Helper/Navigation/Sitemap.php
@@ -267,10 +267,10 @@ public function url(AbstractPage $page)
     {
         $href = $page->getHref();
 
-        if (! isset($href{0})) {
+        if (! isset($href[0])) {
             // no href
             return '';
-        } elseif ($href{0} == '/') {
+        } elseif ($href[0] == '/') {
             // href is relative to root; use serverUrl helper
             $url = $this->getServerUrl() . $href;
         } elseif (preg_match('/^[a-z]+:/im', (string) $href)) {