diff --git a/DependencyInjection/Configuration.php b/DependencyInjection/Configuration.php
index cc8caf6..ed3d264 100644
--- a/DependencyInjection/Configuration.php
+++ b/DependencyInjection/Configuration.php
@@ -115,7 +115,6 @@ public function getConfigTreeBuilder()
                             ->booleanNode('all_databases')->defaultFalse()->end()
                             ->scalarNode('database')->defaultNull()->end()
                             ->scalarNode('db_host')->defaultNull()->end()
-                            //->scalarNode('db_host')->defaultValue('localhost')->end()
                             ->scalarNode('db_port')->defaultValue(3306)->end()
                             ->scalarNode('db_user')->defaultNull()->end()
                             ->scalarNode('db_password')->defaultNull()->end()
@@ -127,7 +126,7 @@ public function getConfigTreeBuilder()
                     ->arrayNode('postgresql')
                         ->children()
                             ->scalarNode('database')->defaultNull()->end()
-                            ->scalarNode('db_host')->defaultValue('localhost')->end()
+                            ->scalarNode('db_host')->defaultNull()->end()
                             ->scalarNode('db_port')->defaultValue(5432)->end()
                             ->scalarNode('db_user')->defaultNull()->end()
                             ->scalarNode('db_password')->defaultNull()->end()