diff --git a/src/activitypub/inbox.js b/src/activitypub/inbox.js
index 754720f208..c1caacd698 100644
--- a/src/activitypub/inbox.js
+++ b/src/activitypub/inbox.js
@@ -32,11 +32,15 @@ function reject(type, object, target, senderType = 'uid', id = 0) {
 	}).catch(err => winston.error(err.stack));
 }
 
+function publiclyAddressed(recipients) {
+	return activitypub._constants.acceptablePublicAddresses.some(address => recipients.includes(address));
+}
+
 inbox.create = async (req) => {
 	const { object, actor } = req.body;
 
 	// Alternative logic for non-public objects
-	const isPublic = [...(object.to || []), ...(object.cc || [])].includes(activitypub._constants.publicAddress);
+	const isPublic = publiclyAddressed([...(object.to || []), ...(object.cc || [])]);
 	if (!isPublic) {
 		return await activitypub.notes.assertPrivate(object);
 	}
@@ -76,7 +80,7 @@ inbox.add = async (req) => {
 
 inbox.update = async (req) => {
 	const { actor, object } = req.body;
-	const isPublic = [...(object.to || []), ...(object.cc || [])].includes(activitypub._constants.publicAddress);
+	const isPublic = publiclyAddressed([...(object.to || []), ...(object.cc || [])]);
 
 	// Origin checking
 	const actorHostname = new URL(actor).hostname;
diff --git a/src/activitypub/index.js b/src/activitypub/index.js
index 11f16322e2..167eb16d15 100644
--- a/src/activitypub/index.js
+++ b/src/activitypub/index.js
@@ -38,6 +38,7 @@ const ActivityPub = module.exports;
 ActivityPub._constants = Object.freeze({
 	uid: -2,
 	publicAddress: 'https://www.w3.org/ns/activitystreams#Public',
+	acceptablePublicAddresses: ['https://www.w3.org/ns/activitystreams#Public', 'as:Public', 'Public'],
 	acceptableTypes: [
 		'application/activity+json',
 		'application/ld+json; profile="https://www.w3.org/ns/activitystreams"',