diff --git a/src/controllers/activitypub/index.js b/src/controllers/activitypub/index.js
index fb57f533c2..1a55109903 100644
--- a/src/controllers/activitypub/index.js
+++ b/src/controllers/activitypub/index.js
@@ -202,6 +202,7 @@ Controller.getOutbox = async (req, res) => {
 
 	res.status(200).json({
 		'@context': 'https://www.w3.org/ns/activitystreams',
+		id: `${nconf.get('url')}/uid/${uid}/outbox`,
 		type: paginate ? 'OrderedCollectionPage' : 'OrderedCollection',
 		totalItems,
 		...(prev && { prev }),