diff --git a/src/Protocol/DFRN.php b/src/Protocol/DFRN.php
index 17bef5d6d9..e858c778e9 100644
--- a/src/Protocol/DFRN.php
+++ b/src/Protocol/DFRN.php
@@ -15,6 +15,7 @@ use Friendica\Core\Worker;
 use Friendica\Database\DBM;
 
 use dba;
+use DOMDocument;
 
 require_once("include/Contact.php");
 require_once("include/ostatus.php");