diff --git a/lib/Twig/Extension/Debug.php b/lib/Twig/Extension/Debug.php
index 97007fb1d..e3a85bfe8 100644
--- a/lib/Twig/Extension/Debug.php
+++ b/lib/Twig/Extension/Debug.php
@@ -24,6 +24,7 @@ class Twig_Extension_Debug extends Twig_Extension
             // false means that it was not set (and the default is on) or it explicitly enabled
             // xdebug.overload_var_dump produces HTML only when html_errors is also enabled
             && (false === ini_get('html_errors') || ini_get('html_errors'))
+            || 'cli' === php_sapi_name()
         ;
 
         return array(