diff --git a/src/Protocol/ActivityPub/Transmitter.php b/src/Protocol/ActivityPub/Transmitter.php
index 7feb70ba7..6a512323c 100644
--- a/src/Protocol/ActivityPub/Transmitter.php
+++ b/src/Protocol/ActivityPub/Transmitter.php
@@ -1345,7 +1345,7 @@ class Transmitter
 	 *
 	 * @return string language string
 	 */
-	private static function getLanguage($item)
+	private static function getLanguage(array $item)
 	{
 		// Try to fetch the language from the post itself
 		if (!empty($item['language'])) {