diff --git a/src/Nodes/CodeBlock.php b/src/Nodes/CodeBlock.php
index 0adb03f..c38aac3 100644
--- a/src/Nodes/CodeBlock.php
+++ b/src/Nodes/CodeBlock.php
@@ -33,7 +33,7 @@ public function addAttributes()
         return [
             'language' => [
                 'parseHTML' => function ($DOMNode) {
-                    if (!($DOMNode->childNodes[0] instanceof \DOMElement)) {
+                    if (! ($DOMNode->childNodes[0] instanceof \DOMElement)) {
                         return null;
                     }