diff --git a/src/Composer/Command/Helper/DialogHelper.php b/src/Composer/Command/Helper/DialogHelper.php
deleted file mode 100644
index 6fb64f27e..000000000
--- a/src/Composer/Command/Helper/DialogHelper.php
+++ /dev/null
@@ -1,36 +0,0 @@
-<?php
-
-/*
- * This file is part of Composer.
- *
- * (c) Nils Adermann <naderman@naderman.de>
- *     Jordi Boggiano <j.boggiano@seld.be>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Composer\Command\Helper;
-
-use Symfony\Component\Console\Helper\DialogHelper as BaseDialogHelper;
-
-class DialogHelper extends BaseDialogHelper
-{
-    /**
-     * Build text for asking a question. For example:
-     *
-     *  "Do you want to continue [yes]:"
-     *
-     * @param string $question The question you want to ask
-     * @param mixed  $default  Default value to add to message, if false no default will be shown
-     * @param string $sep      Separation char for between message and user input
-     *
-     * @return string
-     */
-    public function getQuestion($question, $default = null, $sep = ':')
-    {
-        return $default !== null ?
-            sprintf('<info>%s</info> [<comment>%s</comment>]%s ', $question, $default, $sep) :
-            sprintf('<info>%s</info>%s ', $question, $sep);
-    }
-}
diff --git a/src/Composer/Console/Application.php b/src/Composer/Console/Application.php
index 2ccaec890..b2f9d5e7b 100644
--- a/src/Composer/Console/Application.php
+++ b/src/Composer/Console/Application.php
@@ -20,7 +20,6 @@ use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Output\ConsoleOutput;
 use Symfony\Component\Console\Formatter\OutputFormatter;
 use Composer\Command;
-use Composer\Command\Helper\DialogHelper;
 use Composer\Composer;
 use Composer\Factory;
 use Composer\IO\IOInterface;
@@ -321,15 +320,4 @@ class Application extends BaseApplication
 
         return $definition;
     }
-
-    /**
-     * {@inheritDoc}
-     */
-    protected function getDefaultHelperSet()
-    {
-        $helperSet = parent::getDefaultHelperSet();
-        $helperSet->set(new DialogHelper());
-
-        return $helperSet;
-    }
 }