diff --git a/src/middleware/packages/activitypub/services/activitypub/subservices/outbox.js b/src/middleware/packages/activitypub/services/activitypub/subservices/outbox.js
index cbe2456b9..9100b9e34 100644
--- a/src/middleware/packages/activitypub/services/activitypub/subservices/outbox.js
+++ b/src/middleware/packages/activitypub/services/activitypub/subservices/outbox.js
@@ -27,7 +27,7 @@ const OutboxService = {
   },
   actions: {
     async post(ctx) {
-      let { collectionUri, ...activity } = ctx.params;
+      let { collectionUri, username, ...activity } = ctx.params;
 
       const collectionExists = await ctx.call('activitypub.collection.exist', { resourceUri: collectionUri });
       if (!collectionExists) {