diff --git a/core/lib/Drupal/Core/Installer/InstallerServiceProvider.php b/core/lib/Drupal/Core/Installer/InstallerServiceProvider.php
index df6d26a..fe08e7b 100644
--- a/core/lib/Drupal/Core/Installer/InstallerServiceProvider.php
+++ b/core/lib/Drupal/Core/Installer/InstallerServiceProvider.php
@@ -41,7 +41,7 @@ public function register(ContainerBuilder $container) {
       ->register('keyvalue.expirable', 'Drupal\Core\KeyValueStore\KeyValueNullExpirableFactory');
     $definition = $container->getDefinition('messenger');
     $definition->setClass('Drupal\Core\Messenger\StaticMessenger');
-    $definition->setArguments(new Reference('page_cache_kill_switch'));
+    $definition->setArguments(array(new Reference('page_cache_kill_switch')));
 
     // Replace services with no-op implementations.
     $container