diff --git a/src/Symfony/Component/Console/Style/SymfonyStyle.php b/src/Symfony/Component/Console/Style/SymfonyStyle.php
index 4291ada8f6..02e9b471b8 100644
--- a/src/Symfony/Component/Console/Style/SymfonyStyle.php
+++ b/src/Symfony/Component/Console/Style/SymfonyStyle.php
@@ -229,7 +229,7 @@ class SymfonyStyle extends OutputStyle
     {
         if (null !== $default) {
             $values = array_flip($choices);
-            $default = $values[$default];
+            $default = isset($values[$default]) ? $values[$default] : $default;
         }
 
         return $this->askQuestion(new ChoiceQuestion($question, $choices, $default));