diff --git a/src/DI/ContainerBuilder.php b/src/DI/ContainerBuilder.php
index 563264bf8..636be84d5 100644
--- a/src/DI/ContainerBuilder.php
+++ b/src/DI/ContainerBuilder.php
@@ -669,10 +669,9 @@ private function convertParameters(array $parameters)
 		$res = array();
 		foreach ($parameters as $k => $v) {
 			$tmp = explode(' ', is_int($k) ? $v : $k);
-			$param = $res[] = new Nette\PhpGenerator\Parameter;
-			$param->setName(end($tmp));
+			$param = $res[] = new Nette\PhpGenerator\Parameter(end($tmp));
 			if (!is_int($k)) {
-				$param = $param->setOptional(TRUE)->setDefaultValue($v);
+				$param->setOptional(TRUE)->setDefaultValue($v);
 			}
 			if (isset($tmp[1])) {
 				$param->setTypeHint($tmp[0]);