diff --git a/core/command/upgrade.php b/core/command/upgrade.php
index 5b9432d631..aaeb63a312 100644
--- a/core/command/upgrade.php
+++ b/core/command/upgrade.php
@@ -34,6 +34,7 @@ class Upgrade extends Command {
 	 * @param IConfig $config
 	 */
 	public function __construct(IConfig $config) {
+		parent::__construct();
 		$this->config = $config;
 	}