diff --git a/core/modules/system/system.install b/core/modules/system/system.install
index 614ad9e..bb68bfd 100644
--- a/core/modules/system/system.install
+++ b/core/modules/system/system.install
@@ -239,7 +239,7 @@ function system_requirements($phase) {
 
     $requirements['php_extensions']['value'] = t('Disabled');
     $requirements['php_extensions']['severity'] = REQUIREMENT_ERROR;
-    $requirements['php_extensions']['description'] = $description;
+    $requirements['php_extensions']['description'] = \Drupal::service('renderer')->renderPlain($description);
   }
   else {
     $requirements['php_extensions']['value'] = t('Enabled');