diff --git a/pumpio/pumpio.php b/pumpio/pumpio.php
index 7075873f..e8b740c2 100644
--- a/pumpio/pumpio.php
+++ b/pumpio/pumpio.php
@@ -22,6 +22,7 @@ use Friendica\Model\Group;
 use Friendica\Model\Item;
 use Friendica\Model\User;
 use Friendica\Protocol\Activity;
+use Friendica\Protocol\ActivityNamespace;
 use Friendica\Util\ConfigFileLoader;
 use Friendica\Util\DateTimeFormat;
 use Friendica\Util\Network;