diff --git a/src/Node/Expression/ArrayExpression.php b/src/Node/Expression/ArrayExpression.php
index 9b6c55c29..6c6efee13 100644
--- a/src/Node/Expression/ArrayExpression.php
+++ b/src/Node/Expression/ArrayExpression.php
@@ -12,6 +12,7 @@
 namespace Twig\Node\Expression;
 
 use Twig\Compiler;
+use Twig\Node\Expression\Unary\StringCastUnary;
 
 class ArrayExpression extends AbstractExpression
 {
@@ -99,7 +100,7 @@ class ArrayExpression extends AbstractExpression
             } else {
                 $key = $pair['key'] instanceof ConstantExpression ? $pair['key']->getAttribute('value') : null;
                 if ($pair['key'] instanceof NameExpression) {
-                    $pair['key']->setAttribute('stringify', true);
+                    $pair['key'] = new StringCastUnary($pair['key'], $pair['key']->getTemplateLine());
                 }
 
                 if ($nextIndex !== $key) {
diff --git a/src/Node/Expression/NameExpression.php b/src/Node/Expression/NameExpression.php
index a3f42cd0c..12a9bb71c 100644
--- a/src/Node/Expression/NameExpression.php
+++ b/src/Node/Expression/NameExpression.php
@@ -24,7 +24,7 @@ class NameExpression extends AbstractExpression
 
     public function __construct(string $name, int $lineno)
     {
-        parent::__construct([], ['name' => $name, 'is_defined_test' => false, 'ignore_strict_check' => false, 'always_defined' => false, 'stringify' => false], $lineno);
+        parent::__construct([], ['name' => $name, 'is_defined_test' => false, 'ignore_strict_check' => false, 'always_defined' => false], $lineno);
     }
 
     public function compile(Compiler $compiler): void
@@ -54,9 +54,6 @@ class NameExpression extends AbstractExpression
         } elseif (isset($this->specialVars[$name])) {
             $compiler->raw($this->specialVars[$name]);
         } elseif ($this->getAttribute('always_defined')) {
-            if ($this->getAttribute('stringify')) {
-                $compiler->raw(' (string)');
-            }
             $compiler
                 ->raw('$context[')
                 ->string($name)
@@ -64,9 +61,6 @@ class NameExpression extends AbstractExpression
             ;
         } else {
             if ($this->getAttribute('ignore_strict_check') || !$compiler->getEnvironment()->isStrictVariables()) {
-                if ($this->getAttribute('stringify')) {
-                    $compiler->raw(' (string)');
-                }
                 $compiler
                     ->raw('($context[')
                     ->string($name)
@@ -80,9 +74,6 @@ class NameExpression extends AbstractExpression
                     ->string($name)
                     ->raw(', $context) ?')
                 ;
-                if ($this->getAttribute('stringify')) {
-                    $compiler->raw(' (string)');
-                }
                 $compiler
                     ->raw(' $context[')
                     ->string($name)
diff --git a/src/Node/Expression/Unary/StringCastUnary.php b/src/Node/Expression/Unary/StringCastUnary.php
new file mode 100644
index 000000000..87ea17ca8
--- /dev/null
+++ b/src/Node/Expression/Unary/StringCastUnary.php
@@ -0,0 +1,22 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Twig\Node\Expression\Unary;
+
+use Twig\Compiler;
+
+final class StringCastUnary extends AbstractUnary
+{
+    public function operator(Compiler $compiler): Compiler
+    {
+        return $compiler->raw('(string)');
+    }
+}