diff --git a/core/modules/system/lib/Drupal/system/Plugin/Block/SystemHelpBlock.php b/core/modules/system/lib/Drupal/system/Plugin/Block/SystemHelpBlock.php
index 23520a3..986dfa9 100644
--- a/core/modules/system/lib/Drupal/system/Plugin/Block/SystemHelpBlock.php
+++ b/core/modules/system/lib/Drupal/system/Plugin/Block/SystemHelpBlock.php
@@ -10,6 +10,10 @@
 use Drupal\block\BlockBase;
 use Drupal\block\Annotation\Block;
 use Drupal\Core\Annotation\Translation;
+use Drupal\Core\Extension\ModuleHandlerInterface;
+use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\HttpFoundation\Request;

 /**
  * Provides a 'System Help' block.
@@ -19,7 +23,7 @@
  *   admin_label = @Translation("System Help")
  * )
  */
-class SystemHelpBlock extends BlockBase {
+class SystemHelpBlock extends BlockBase implements ContainerFactoryPluginInterface {

   /**
    * Stores the help text associated with the active menu item.
@@ -29,14 +33,83 @@ class SystemHelpBlock extends BlockBase {
   protected $help;

   /**
+   * The module handler.
+   *
+   * @var \Drupal\Core\Extension\ModuleHandlerInterface
+   */
+  protected $moduleHandler;
+
+  /**
+   * The current request.
+   *
+   * @var \Symfony\Component\HttpFoundation\Request
+   */
+  protected $request;
+
+  /**
+   * Creates a SystemHelpBlock instance.
+   *
+   * @param array $configuration
+   *   A configuration array containing information about the plugin instance.
+   * @param string $plugin_id
+   *   The plugin_id for the plugin instance.
+   * @param array $plugin_definition
+   *   The plugin implementation definition.
+   * @param \Symfony\Component\HttpFoundation\Request $request
+   *   The current request.
+   * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
+   *   The module handler.
+   */
+  public function __construct(array $configuration, $plugin_id, array $plugin_definition, Request $request, ModuleHandlerInterface $module_handler) {
+    parent::__construct($configuration, $plugin_id, $plugin_definition);
+
+    $this->request = $request;
+    $this->moduleHandler = $module_handler;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container, array $configuration, $plugin_id, array $plugin_definition) {
+    return new static(
+      $configuration, $plugin_id, $plugin_definition, $container->get('request'), $container->get('module_handler'));
+  }
+
+  /**
    * Overrides \Drupal\block\BlockBase::access().
    */
   public function access() {
-    $this->help = menu_get_active_help();
+    $this->help = $this->getActiveHelp($this->request);
     return (bool) $this->help;
   }

   /**
+   * Returns the help associated with the active menu item.
+   *
+   * @param \Symfony\Component\HttpFoundation\Request $request
+   *   The current request.
+   */
+  protected function getActiveHelp(Request $request) {
+    $output = '';
+    $router_path = menu_tab_root_path();
+    // We will always have a path unless we are on a 403 or 404.
+    if (!$router_path) {
+      return '';
+    }
+
+    $arg = drupal_help_arg(explode('/', $request->attributes->get('_system_path')));
+
+    foreach ($this->moduleHandler->getImplementations('help') as $module) {
+      $function = $module . '_help';
+      // Lookup help for this path.
+      if ($help = $function($router_path, $arg)) {
+        $output .= $help . "\n";
+      }
+    }
+    return $output;
+  }
+
+  /**
    * {@inheritdoc}
    */
   public function build() {