diff --git a/src/Symfony/Component/Console/Application.php b/src/Symfony/Component/Console/Application.php
index 0f04526808..d3504cea0b 100644
--- a/src/Symfony/Component/Console/Application.php
+++ b/src/Symfony/Component/Console/Application.php
@@ -697,7 +697,7 @@ class Application
     {
         $strlen = function ($string)
         {
-            return function_exists('mb_strlen') ? mb_strlen($string) : strlen($string);
+            return function_exists('mb_strlen') ? mb_strlen($string, mb_detect_encoding($string)) : strlen($string);
         };
 
         do {