diff --git a/src/Composer/Command/Helper/DialogHelper.php b/src/Composer/Command/Helper/DialogHelper.php
index 674b03800..d08ac1946 100644
--- a/src/Composer/Command/Helper/DialogHelper.php
+++ b/src/Composer/Command/Helper/DialogHelper.php
@@ -28,9 +28,9 @@ class DialogHelper extends BaseDialogHelper
      *
      * @return string
      */
-    public function getQuestion($question, $default, $sep = ':')
+    public function getQuestion($question, $default = null, $sep = ':')
     {
-        return $default ?
+        return $default !== null ?
             sprintf('<info>%s</info> [<comment>%s</comment>]%s ', $question, $default, $sep) :
             sprintf('<info>%s</info>%s ', $question, $sep);
     }