diff --git a/src/Extension/CommonMark/Renderer/Block/FencedCodeRenderer.php b/src/Extension/CommonMark/Renderer/Block/FencedCodeRenderer.php
index bfdc636a50..8df9a40e89 100644
--- a/src/Extension/CommonMark/Renderer/Block/FencedCodeRenderer.php
+++ b/src/Extension/CommonMark/Renderer/Block/FencedCodeRenderer.php
@@ -42,9 +42,10 @@ public function render(Node $node, ChildNodeRendererInterface $childRenderer): \
         $infoWords = $node->getInfoWords();
         if (\count($infoWords) !== 0 && $infoWords[0] !== '') {
             $class = $infoWords[0];
-            if (!\str_starts_with($class, 'language-')) {
+            if (! \str_starts_with($class, 'language-')) {
                 $class = 'language-' . $class;
             }
+
             $attrs->append('class', $class);
         }