diff --git a/core/lib/Drupal/Core/Extension/ThemeInstaller.php b/core/lib/Drupal/Core/Extension/ThemeInstaller.php
index 6385fcb962..36b67e25fb 100644
--- a/core/lib/Drupal/Core/Extension/ThemeInstaller.php
+++ b/core/lib/Drupal/Core/Extension/ThemeInstaller.php
@@ -101,7 +101,7 @@ class ThemeInstaller implements ThemeInstallerInterface {
    *   The state store.
    * @param \Drupal\Core\Extension\ModuleExtensionList $module_extension_list
    *   The module extension list.
-   * @param \Drupal\Core\Theme\Registry $themeRegistry
+   * @param \Drupal\Core\Theme\Registry|null $themeRegistry
    *   The theme registry.
    */
   public function __construct(ThemeHandlerInterface $theme_handler, ConfigFactoryInterface $config_factory, ConfigInstallerInterface $config_installer, ModuleHandlerInterface $module_handler, ConfigManagerInterface $config_manager, AssetCollectionOptimizerInterface $css_collection_optimizer, RouteBuilderInterface $route_builder, LoggerInterface $logger, StateInterface $state, ModuleExtensionList $module_extension_list, protected ?Registry $themeRegistry = NULL) {