diff --git a/core/modules/system/system.install b/core/modules/system/system.install
index afa5892..e34b4b1 100644
--- a/core/modules/system/system.install
+++ b/core/modules/system/system.install
@@ -784,7 +784,7 @@ function system_requirements($phase) {
   }
 
   // Check if the Twig C extension is available.
-  if ($phase == 'runtime') {
+  if ($phase == 'runtime' && (version_compare($phpversion, 7) < 0)) {
     $url = 'http://twig.sensiolabs.org/doc/installation.html#installing-the-c-extension';
     $requirements['twig_c_extension'] = [
       'title' => t('Twig C extension'),
@@ -792,7 +792,7 @@ function system_requirements($phase) {
     ];
     if (!function_exists('twig_template_get_attributes')) {
       $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]);
+      $requirements['twig_c_extension']['description'] = t('Enabling the Twig C extension can increase rendering performance. See <a href=":url">the installation instructions</a> for more detail.', [':url' => $url]);
     }
     else {
       $requirements['twig_c_extension']['description'] = t('The <a href=":url">Twig C extension</a> is available', [':url' => $url]);