diff --git a/core/lib/Drupal/Core/EventSubscriber/RequestCloseSubscriber.php b/core/lib/Drupal/Core/EventSubscriber/RequestCloseSubscriber.php
index 9b3ef45..60407f4 100644
--- a/core/lib/Drupal/Core/EventSubscriber/RequestCloseSubscriber.php
+++ b/core/lib/Drupal/Core/EventSubscriber/RequestCloseSubscriber.php
@@ -39,7 +39,7 @@ class RequestCloseSubscriber implements EventSubscriberInterface {
     if ($config->get('cache') && ($cache = drupal_page_set_cache())) {
       drupal_serve_page_from_cache($cache);
     }
-    else {
+    elseif(!drupal_is_cli()) {
       ob_flush();
     }