diff --git a/retriever/retriever.php b/retriever/retriever.php
index 46916647..a5e2f779 100644
--- a/retriever/retriever.php
+++ b/retriever/retriever.php
@@ -6,6 +6,7 @@
    * Author: Matthew Exon <http://mat.exon.name>
    */
 
+use Friendica\App;
 use Friendica\Core\Addon;
 use Friendica\Core\Hook;
 use Friendica\Core\Logger;
@@ -972,10 +973,10 @@ function retriever_content(App $a) {
 /**
  * @brief Hook that adds the retriever option to the contact menu
  *
- * @param App $a The App object
+ * @param App $a The App object (by ref)
  * @param array $args Contact menu details to be filled in (by ref)
  */
-function retriever_contact_photo_menu(array &$args) {
+function retriever_contact_photo_menu(App &$a, array &$args) {
 	if (!$args) {
 		return;
 	}