diff --git a/src/Kdyby/Redis/Driver/PhpRedisDriver.php b/src/Kdyby/Redis/Driver/PhpRedisDriver.php
index fa2a06d..e9e5cc2 100644
--- a/src/Kdyby/Redis/Driver/PhpRedisDriver.php
+++ b/src/Kdyby/Redis/Driver/PhpRedisDriver.php
@@ -46,7 +46,7 @@ public function select($database)
 	/**
 	 * {@inheritdoc}
 	 */
-	public function script($command, $script = NULL)
+	public function script($command, $script)
 	{
 		$args = func_get_args();
 		return call_user_func_array('parent::script', $args);