diff --git a/js/src/views/Event/Event.vue b/js/src/views/Event/Event.vue
index 8e02c4cc8..cde8a44a3 100644
--- a/js/src/views/Event/Event.vue
+++ b/js/src/views/Event/Event.vue
@@ -949,6 +949,7 @@ export default class Event extends EventMixin {
         mutation: JOIN_EVENT,
         variables: {
           eventId: this.event.id,
+          actorId: identity.id,
           message,
         },
         update: (store, { data }) => {