diff --git a/src/Protocol/ActivityPub.php b/src/Protocol/ActivityPub.php
index 45279576b7..a73f77a165 100644
--- a/src/Protocol/ActivityPub.php
+++ b/src/Protocol/ActivityPub.php
@@ -77,6 +77,7 @@ class ActivityPub
 	public static function isRequest()
 	{
 		return stristr($_SERVER['HTTP_ACCEPT'] ?? '', 'application/activity+json') ||
+			stristr($_SERVER['HTTP_ACCEPT'] ?? '', 'application/json') ||
 			stristr($_SERVER['HTTP_ACCEPT'] ?? '', 'application/ld+json');
 	}