diff --git a/src/Protocol/ActivityPub/Transmitter.php b/src/Protocol/ActivityPub/Transmitter.php
index aeb27a819c..17ad0d350f 100644
--- a/src/Protocol/ActivityPub/Transmitter.php
+++ b/src/Protocol/ActivityPub/Transmitter.php
@@ -442,7 +442,7 @@ class Transmitter
 	 *
 	 * @return activity type
 	 */
-	public static function getTypeOfItem($item)
+	private static function getTypeOfItem($item)
 	{
 		if ($item['verb'] == ACTIVITY_POST) {
 			if ($item['created'] == $item['edited']) {