diff --git a/webdav_storage/webdav_storage.php b/webdav_storage/webdav_storage.php
index adcbea29..fd2eb0d9 100644
--- a/webdav_storage/webdav_storage.php
+++ b/webdav_storage/webdav_storage.php
@@ -8,11 +8,10 @@
 
 use Friendica\Addon\webdav_storage\src\WebDav;
 use Friendica\Addon\webdav_storage\src\WebDavConfig;
-use Friendica\App;
 use Friendica\Core\Hook;
 use Friendica\DI;
 
-function webdav_storage_install($a)
+function webdav_storage_install()
 {
 	Hook::register('storage_instance' , __FILE__, 'webdav_storage_instance');
 	Hook::register('storage_config' , __FILE__, 'webdav_storage_config');