diff --git a/core/modules/system/system.install b/core/modules/system/system.install
index 550fca7..8f9c15f 100644
--- a/core/modules/system/system.install
+++ b/core/modules/system/system.install
@@ -650,17 +650,17 @@ function system_requirements($phase) {
 
   // Check if the Twig C extension is available.
   if ($phase == 'runtime') {
-    $url = Url::fromUri('http://twig.sensiolabs.org/doc/installation.html#installing-the-c-extension')->toString();
-    $requirements['twig_c_ext'] = [
+    $url = 'http://twig.sensiolabs.org/doc/installation.html#installing-the-c-extension';
+    $requirements['twig_c_extension'] = [
       'title' => t('Twig C extension'),
       'severity' => REQUIREMENT_INFO,
     ];
     if (!function_exists('twig_template_get_attributes')) {
-      $requirements['twig_c_ext']['value'] = t('Not available');
-      $requirements['twig_c_ext']['description'] = t('Enabling the Twig C extension can greatly increase performance. See <a href="@url">the installation instructions</a> for more detail.', ['@url' => $url]);
+      $requirements['twig_c_extension']['value'] = t('Not available');
+      $requirements['twig_c_extension']['description'] = t('Enabling the Twig C extension can greatly increase rendering performance. See <a href="@url">the installation instructions</a> for more detail.', ['@url' => $url]);
     }
     else {
-      $requirements['twig_c_ext']['description'] = t('The <a href="@url">Twig C extension</a> is available', ['@url' => $url]);
+      $requirements['twig_c_extension']['description'] = t('The <a href="@url">Twig C extension</a> is available', ['@url' => $url]);
     }
   }