diff --git a/src/Node/Expression/ConstantExpression.php b/src/Node/Expression/ConstantExpression.php
index 7ddbcc6fa..2a8909d54 100644
--- a/src/Node/Expression/ConstantExpression.php
+++ b/src/Node/Expression/ConstantExpression.php
@@ -14,6 +14,9 @@ namespace Twig\Node\Expression;
 
 use Twig\Compiler;
 
+/**
+ * @final
+ */
 class ConstantExpression extends AbstractExpression
 {
     public function __construct($value, int $lineno)