diff --git a/src/Module/Calendar/Event/API.php b/src/Module/Calendar/Event/API.php
index efa4644e24..3223ecd42b 100644
--- a/src/Module/Calendar/Event/API.php
+++ b/src/Module/Calendar/Event/API.php
@@ -7,12 +7,13 @@
 
 namespace Friendica\Module\Calendar\Event;
 
-use Friendica\App;
+use Friendica\App\Arguments;
+use Friendica\App\BaseURL;
+use Friendica\AppHelper;
 use Friendica\BaseModule;
 use Friendica\Core\L10n;
 use Friendica\Core\Protocol;
 use Friendica\Core\Session\Capability\IHandleUserSessions;
-use Friendica\Core\System;
 use Friendica\Core\Worker;
 use Friendica\Database\DBA;
 use Friendica\Model\Contact;
@@ -61,14 +62,14 @@ class API extends BaseModule
 	/** @var string */
 	protected $timezone;
 
-	public function __construct(L10n $l10n, App\BaseURL $baseUrl, App\Arguments $args, LoggerInterface $logger, Profiler $profiler, Response $response, IHandleUserSessions $session, SystemMessages $sysMessages, ACLFormatter $aclFormatter, App $app, array $server, array $parameters = [])
+	public function __construct(L10n $l10n, BaseURL $baseUrl, Arguments $args, LoggerInterface $logger, Profiler $profiler, Response $response, IHandleUserSessions $session, SystemMessages $sysMessages, ACLFormatter $aclFormatter, AppHelper $appHelper, array $server, array $parameters = [])
 	{
 		parent::__construct($l10n, $baseUrl, $args, $logger, $profiler, $response, $server, $parameters);
 
 		$this->session      = $session;
 		$this->sysMessages  = $sysMessages;
 		$this->aclFormatter = $aclFormatter;
-		$this->timezone     = $app->getTimeZone();
+		$this->timezone     = $appHelper->getTimeZone();
 
 		if (!$this->session->getLocalUserId()) {
 			throw new UnauthorizedException($this->t('Permission denied.'));