diff --git a/lib/activityutils.php b/lib/activityutils.php
index dcccbb8d87..4f31648ead 100644
--- a/lib/activityutils.php
+++ b/lib/activityutils.php
@@ -301,7 +301,7 @@ class ActivityUtils
         return false;
     }
 
-    static function getFeedAuthor(DOMDocument $feedEl)
+    static function getFeedAuthor(DOMElement $feedEl)
     {
         // Try old and deprecated activity:subject