diff --git a/src/Util/Crypto.php b/src/Util/Crypto.php
index 54c3049ca7..1e4672887e 100644
--- a/src/Util/Crypto.php
+++ b/src/Util/Crypto.php
@@ -7,6 +7,7 @@ namespace Friendica\Util;
 use Friendica\Core\Config;
 use Friendica\Core\Hook;
 use Friendica\Core\Logger;
+use Friendica\Core\System;
 use ASN_BASE;
 use ASNValue;