diff --git a/src/Behat/MinkExtension/ServiceContainer/Driver/Selenium2Factory.php b/src/Behat/MinkExtension/ServiceContainer/Driver/Selenium2Factory.php
index fcdcebaf..85006fa3 100644
--- a/src/Behat/MinkExtension/ServiceContainer/Driver/Selenium2Factory.php
+++ b/src/Behat/MinkExtension/ServiceContainer/Driver/Selenium2Factory.php
@@ -145,6 +145,7 @@ protected function getCapabilitiesNode()
                     ->children()
                         ->arrayNode('switches')->prototype('scalar')->end()->end()
                         ->scalarNode('binary')->end()
+                        ->booleanNode('w3c')->end()
                         ->arrayNode('extensions')->prototype('scalar')->end()->end()
                     ->end()
                 ->end()