diff --git a/typo3/sysext/frontend/Classes/ContentObject/ContentObjectRenderer.php b/typo3/sysext/frontend/Classes/ContentObject/ContentObjectRenderer.php
index 930ad5de4fb738fd7e869209092bc7c3435c21f0..1866b743c94fe4d9f6911093c0f7d05e1f318726 100644
--- a/typo3/sysext/frontend/Classes/ContentObject/ContentObjectRenderer.php
+++ b/typo3/sysext/frontend/Classes/ContentObject/ContentObjectRenderer.php
@@ -3688,7 +3688,7 @@ class ContentObjectRenderer implements LoggerAwareInterface
                 $tag = explode(' ', trim($tagContent), 2);
                 $tag[0] = strtolower($tag[0]);
                 // end tag like </li>
-                if ($tag[0][0] === '/') {
+                if (str_starts_with($tag[0], '/')) {
                     $tag[0] = substr($tag[0], 1);
                     $tag['out'] = 1;
                 }