diff --git a/core/modules/system/system.install b/core/modules/system/system.install
index f38af8a..a5138c7 100644
--- a/core/modules/system/system.install
+++ b/core/modules/system/system.install
@@ -434,24 +434,22 @@ function system_requirements($phase) {
     }
 
     // Set summary and description based on values determined above.
-    $summary = t('Last run !time ago', array('!time' => \Drupal::service('date.formatter')->formatTimeDiffSince($cron_last)));
+    $summary = t('Last run @time ago', array('@time' => \Drupal::service('date.formatter')->formatTimeDiffSince($cron_last)));
     $description = '';
     if ($severity != REQUIREMENT_INFO) {
       $description = t('Cron has not run recently.') . ' ' . $help;
     }
 
     $description .= ' ' . t('You can <a href="@cron">run cron manually</a>.', array('@cron' => \Drupal::url('system.run_cron')));
-    $description .= '<br />' . t('To run cron from outside the site, go to <a href="!cron">!cron</a>', array('!cron' => \Drupal::url('system.cron', array('key' => \Drupal::state()->get('system.cron_key'), array('absolute' => TRUE)))));
+    $description .= '<br />' . t('To run cron from outside the site, go to <a href="@cron">!cron</a>', array('@cron' => \Drupal::url('system.cron', array('key' => \Drupal::state()->get('system.cron_key'), array('absolute' => TRUE)))));
 
     $requirements['cron'] = array(
       'title' => t('Cron maintenance tasks'),
       'severity' => $severity,
       'value' => $summary,
-      // @todo This string is concatenated from t() calls, safe drupal_render()
-      //   output, whitespace, and <br /> tags, so is safe. However, as a best
-      //   practice, we should not use SafeMarkup::set() around a variable. Fix
-      //   in: https://www.drupal.org/node/2296929.
-      'description' => SafeMarkup::set($description),
+      // This string is concatenated from t() calls, drupal_render() output,
+      // whitespace, and <br> tags so we pass it through as markup.
+      'description' => ['#markup' => $description],
     );
   }
   if ($phase != 'install') {