diff --git a/core/modules/search/lib/Drupal/search/Form/SearchSettingsForm.php b/core/modules/search/lib/Drupal/search/Form/SearchSettingsForm.php
index e034497..3ec0ba1 100644
--- a/core/modules/search/lib/Drupal/search/Form/SearchSettingsForm.php
+++ b/core/modules/search/lib/Drupal/search/Form/SearchSettingsForm.php
@@ -24,6 +24,13 @@ class SearchSettingsForm extends SystemConfigFormBase {
    */
   protected $moduleHandler;
 
+  /**
+   * A factory for configuration objects. Used to retrieve the current search
+   * settings.
+   *
+   * @var \Drupal\Core\Config\ConfigFactory
+   */
+  private $configFactory;
 
   /**
    * Constructs a \Drupal\user\SearchSettingsForm object.