diff --git a/DependencyInjection/Factory/FtpAdapterFactory.php b/DependencyInjection/Factory/FtpAdapterFactory.php
index f59b18d..986f822 100644
--- a/DependencyInjection/Factory/FtpAdapterFactory.php
+++ b/DependencyInjection/Factory/FtpAdapterFactory.php
@@ -47,6 +47,7 @@ class FtpAdapterFactory implements AdapterFactoryInterface
                 ->scalarNode('password')->defaultNull()->end()
                 ->booleanNode('passive')->defaultFalse()->end()
                 ->booleanNode('create')->defaultFalse()->end()
+                ->booleanNode('ssl')->defaultFalse()->end()
                 ->scalarNode('mode')
                     ->defaultValue(defined('FTP_ASCII') ? FTP_ASCII : null)
                     ->beforeNormalization()