diff --git a/appservice/consumers/roomserver.go b/appservice/consumers/roomserver.go
index 04eb3d992..3e47dee56 100644
--- a/appservice/consumers/roomserver.go
+++ b/appservice/consumers/roomserver.go
@@ -101,11 +101,11 @@ func (s *OutputRoomEventConsumer) onMessage(msg *sarama.ConsumerMessage) error {
 		"type":     ev.Type(),
 	}).Info("appservice received an event from roomserver")
 
-	missingEvents, err := s.lookupMissingStateEvents(output.NewRoomEvent.AddsStateEventIDs, ev)
+	missingEvents, err := s.lookupMissingStateEvents(output.NewRoomEvent.AddsStateEventIDs, ev.Event)
 	if err != nil {
 		return err
 	}
-	events := append(missingEvents, ev)
+	events := append(missingEvents, ev.Event)
 
 	// Send event to any relevant application services
 	return s.filterRoomserverEvents(context.TODO(), events)
diff --git a/clientapi/consumers/roomserver.go b/clientapi/consumers/roomserver.go
index e90d56693..6d5bb09a6 100644
--- a/clientapi/consumers/roomserver.go
+++ b/clientapi/consumers/roomserver.go
@@ -91,7 +91,7 @@ func (s *OutputRoomEventConsumer) onMessage(msg *sarama.ConsumerMessage) error {
 		"type":     ev.Type(),
 	}).Info("received event from roomserver")
 
-	events, err := s.lookupStateEvents(output.NewRoomEvent.AddsStateEventIDs, ev)
+	events, err := s.lookupStateEvents(output.NewRoomEvent.AddsStateEventIDs, ev.Event)
 	if err != nil {
 		return err
 	}
diff --git a/federationsender/consumers/roomserver.go b/federationsender/consumers/roomserver.go
index 39d8d62db..2d4b1b2ef 100644
--- a/federationsender/consumers/roomserver.go
+++ b/federationsender/consumers/roomserver.go
@@ -109,7 +109,7 @@ func (s *OutputRoomEventConsumer) onMessage(msg *sarama.ConsumerMessage) error {
 // processMessage updates the list of currently joined hosts in the room
 // and then sends the event to the hosts that were joined before the event.
 func (s *OutputRoomEventConsumer) processMessage(ore api.OutputNewRoomEvent) error {
-	addsStateEvents, err := s.lookupStateEvents(ore.AddsStateEventIDs, ore.Event)
+	addsStateEvents, err := s.lookupStateEvents(ore.AddsStateEventIDs, ore.Event.Event)
 	if err != nil {
 		return err
 	}
@@ -155,7 +155,7 @@ func (s *OutputRoomEventConsumer) processMessage(ore api.OutputNewRoomEvent) err
 
 	// Send the event.
 	return s.queues.SendEvent(
-		&ore.Event, gomatrixserverlib.ServerName(ore.SendAsServer), joinedHostsAtEvent,
+		&ore.Event.Event, gomatrixserverlib.ServerName(ore.SendAsServer), joinedHostsAtEvent,
 	)
 }
 
@@ -178,7 +178,7 @@ func (s *OutputRoomEventConsumer) joinedHostsAtEvent(
 		ore.AddsStateEventIDs, ore.RemovesStateEventIDs,
 		ore.StateBeforeAddsEventIDs, ore.StateBeforeRemovesEventIDs,
 	)
-	combinedAddsEvents, err := s.lookupStateEvents(combinedAdds, ore.Event)
+	combinedAddsEvents, err := s.lookupStateEvents(combinedAdds, ore.Event.Event)
 	if err != nil {
 		return nil, err
 	}
diff --git a/roomserver/api/output.go b/roomserver/api/output.go
index c09d5a1e5..4e7adff79 100644
--- a/roomserver/api/output.go
+++ b/roomserver/api/output.go
@@ -54,7 +54,7 @@ type OutputEvent struct {
 // prev_events.
 type OutputNewRoomEvent struct {
 	// The Event.
-	Event gomatrixserverlib.Event `json:"event"`
+	Event gomatrixserverlib.HeaderedEvent `json:"event"`
 	// The latest events in the room after this event.
 	// This can be used to set the prev events for new events in the room.
 	// This also can be used to get the full current state after this event.
@@ -117,7 +117,7 @@ type OutputNewRoomEvent struct {
 // tracked separately from the room events themselves.
 type OutputNewInviteEvent struct {
 	// The "m.room.member" invite event.
-	Event gomatrixserverlib.Event `json:"event"`
+	Event gomatrixserverlib.HeaderedEvent `json:"event"`
 }
 
 // An OutputRetireInviteEvent is written whenever an existing invite is no longer
diff --git a/roomserver/input/latest_events.go b/roomserver/input/latest_events.go
index f9fd1d5d4..9a99ad76f 100644
--- a/roomserver/input/latest_events.go
+++ b/roomserver/input/latest_events.go
@@ -253,8 +253,11 @@ func (u *latestEventsUpdater) makeOutputNewRoomEvent() (*api.OutputEvent, error)
 		latestEventIDs[i] = u.latest[i].EventID
 	}
 
+	// TODO: Room version here
+	roomVersion := gomatrixserverlib.RoomVersionV1
+
 	ore := api.OutputNewRoomEvent{
-		Event:           u.event,
+		Event:           u.event.Headered(roomVersion),
 		LastSentEventID: u.lastEventIDSent,
 		LatestEventIDs:  latestEventIDs,
 		TransactionID:   u.transactionID,
diff --git a/roomserver/input/membership.go b/roomserver/input/membership.go
index 841c5fec6..f2ac3b510 100644
--- a/roomserver/input/membership.go
+++ b/roomserver/input/membership.go
@@ -136,13 +136,14 @@ func updateToInviteMembership(
 		return nil, err
 	}
 	if needsSending {
+		roomVersion := gomatrixserverlib.RoomVersionV1
 		// We notify the consumers using a special event even though we will
 		// notify them about the change in current state as part of the normal
 		// room event stream. This ensures that the consumers only have to
 		// consider a single stream of events when determining whether a user
 		// is invited, rather than having to combine multiple streams themselves.
 		onie := api.OutputNewInviteEvent{
-			Event: *add,
+			Event: (*add).Headered(roomVersion),
 		}
 		updates = append(updates, api.OutputEvent{
 			Type:           api.OutputTypeNewInviteEvent,
diff --git a/syncapi/consumers/roomserver.go b/syncapi/consumers/roomserver.go
index 976dd8e8f..5aaff5627 100644
--- a/syncapi/consumers/roomserver.go
+++ b/syncapi/consumers/roomserver.go
@@ -98,7 +98,7 @@ func (s *OutputRoomEventConsumer) onMessage(msg *sarama.ConsumerMessage) error {
 func (s *OutputRoomEventConsumer) onNewRoomEvent(
 	ctx context.Context, msg api.OutputNewRoomEvent,
 ) error {
-	ev := msg.Event
+	ev := msg.Event.Event
 	log.WithFields(log.Fields{
 		"event_id": ev.EventID(),
 		"room_id":  ev.RoomID(),
@@ -153,7 +153,7 @@ func (s *OutputRoomEventConsumer) onNewRoomEvent(
 func (s *OutputRoomEventConsumer) onNewInviteEvent(
 	ctx context.Context, msg api.OutputNewInviteEvent,
 ) error {
-	pduPos, err := s.db.AddInviteEvent(ctx, msg.Event)
+	pduPos, err := s.db.AddInviteEvent(ctx, msg.Event.Event)
 	if err != nil {
 		// panic rather than continue with an inconsistent database
 		log.WithFields(log.Fields{
@@ -163,7 +163,7 @@ func (s *OutputRoomEventConsumer) onNewInviteEvent(
 		}).Panicf("roomserver output log: write invite failure")
 		return nil
 	}
-	s.notifier.OnNewEvent(&msg.Event, "", nil, types.PaginationToken{PDUPosition: pduPos})
+	s.notifier.OnNewEvent(&msg.Event.Event, "", nil, types.PaginationToken{PDUPosition: pduPos})
 	return nil
 }