diff --git a/src/remote/activitypub/renderer/index.ts b/src/remote/activitypub/renderer/index.ts
index ee7f496162..55b2801cad 100644
--- a/src/remote/activitypub/renderer/index.ts
+++ b/src/remote/activitypub/renderer/index.ts
@@ -1,7 +1,16 @@
-export default (x: any) => Object.assign({
-	'@context': [
-		'https://www.w3.org/ns/activitystreams',
-		'https://w3id.org/security/v1',
-		{ Hashtag: 'as:Hashtag' }
-	]
-}, x);
+import config from '../../../config';
+import * as uuid from 'uuid';
+
+export default (x: any) => {
+	if (x !== null && typeof x === 'object' && x.id == null) {
+		x.id = `${config.url}/${uuid.v4()}`;
+	}
+
+	return Object.assign({
+		'@context': [
+			'https://www.w3.org/ns/activitystreams',
+			'https://w3id.org/security/v1',
+			{ Hashtag: 'as:Hashtag' }
+		]
+	}, x);
+};