diff --git a/Plugin/PageConfigRenderer.php b/Plugin/PageConfigRenderer.php
index 4f026eb..0a2b437 100644
--- a/Plugin/PageConfigRenderer.php
+++ b/Plugin/PageConfigRenderer.php
@@ -23,7 +23,7 @@ public function afterRenderAssets(
             return $result;
         }
 
-        preg_match_all('/<link.*rel="preload".*\/>/', $result, $links);
+        preg_match_all('/<link.*rel="preload".*\/>/U', $result, $links);
 
         foreach ($links[0] as $link) {
             if (strpos($link, '.woff') === false ||