diff --git a/DependencyInjection/Configuration.php b/DependencyInjection/Configuration.php
index bfe54a7..52a5840 100644
--- a/DependencyInjection/Configuration.php
+++ b/DependencyInjection/Configuration.php
@@ -35,7 +35,7 @@ private function addClientNode()
           ->children()
               ->scalarNode('host')->isRequired()->cannotBeEmpty()->end()
               ->scalarNode('port')->defaultValue(389)->end()
-              ->scalarNode('version')->end()
+              ->scalarNode('version')->defaultValue(3)->end()
               ->scalarNode('username')->end()
               ->scalarNode('password')->end()
               ->booleanNode('bind_username_before')->defaultFalse()->end()