diff --git a/core/lib/Drupal/Core/DependencyInjection/Compiler/TwigExtensionPass.php b/core/lib/Drupal/Core/DependencyInjection/Compiler/TwigExtensionPass.php
index e2a0edf..f7ac226 100644
--- a/core/lib/Drupal/Core/DependencyInjection/Compiler/TwigExtensionPass.php
+++ b/core/lib/Drupal/Core/DependencyInjection/Compiler/TwigExtensionPass.php
@@ -20,7 +20,7 @@ class TwigExtensionPass implements CompilerPassInterface {
    */
   public function process(ContainerBuilder $container) {
     $twig_extension_hash = '';
-    foreach (array_keys($container->findTaggedServiceIds('twig.extension') as $service_id) {
+    foreach (array_keys($container->findTaggedServiceIds('twig.extension')) as $service_id) {
       $twig_extension_hash .= $container->getDefinition($service_id)->getClass();
     }