3 files changed, 10 insertions, 4 deletions
diff --git a/setup/mscs/msc2836/msc2836.go b/setup/mscs/msc2836/msc2836.go
index f468b048..5ce3b430 100644
--- a/setup/mscs/msc2836/msc2836.go
+++ b/setup/mscs/msc2836/msc2836.go
@@ -92,9 +92,11 @@ type MSC2836EventRelationshipsResponse struct {
 	ParsedAuthChain []gomatrixserverlib.PDU
 }
 
-func toClientResponse(res *MSC2836EventRelationshipsResponse) *EventRelationshipResponse {
+func toClientResponse(ctx context.Context, res *MSC2836EventRelationshipsResponse, rsAPI roomserver.RoomserverInternalAPI) *EventRelationshipResponse {
 	out := &EventRelationshipResponse{
-		Events:    synctypes.ToClientEvents(gomatrixserverlib.ToPDUs(res.ParsedEvents), synctypes.FormatAll),
+		Events: synctypes.ToClientEvents(gomatrixserverlib.ToPDUs(res.ParsedEvents), synctypes.FormatAll, func(roomID, senderID string) (*spec.UserID, error) {
+			return rsAPI.QueryUserIDForSender(ctx, roomID, senderID)
+		}),
 		Limited:   res.Limited,
 		NextBatch: res.NextBatch,
 	}
@@ -187,7 +189,7 @@ func eventRelationshipHandler(db Database, rsAPI roomserver.RoomserverInternalAP
 
 		return util.JSONResponse{
 			Code: 200,
-			JSON: toClientResponse(res),
+			JSON: toClientResponse(req.Context(), res, rsAPI),
 		}
 	}
 }
diff --git a/setup/mscs/msc2836/msc2836_test.go b/setup/mscs/msc2836/msc2836_test.go
index 2c6f63d4..c463fd72 100644
--- a/setup/mscs/msc2836/msc2836_test.go
+++ b/setup/mscs/msc2836/msc2836_test.go
@@ -525,6 +525,10 @@ type testRoomserverAPI struct {
 	events            map[string]*types.HeaderedEvent
 }
 
+func (r *testRoomserverAPI) QueryUserIDForSender(ctx context.Context, roomID string, senderID string) (*spec.UserID, error) {
+	return spec.NewUserID(senderID, true)
+}
+
 func (r *testRoomserverAPI) QueryEventsByID(ctx context.Context, req *roomserver.QueryEventsByIDRequest, res *roomserver.QueryEventsByIDResponse) error {
 	for _, eventID := range req.EventIDs {
 		ev := r.events[eventID]
diff --git a/setup/mscs/msc2946/msc2946.go b/setup/mscs/msc2946/msc2946.go
index 291e0f3b..f380d3d4 100644
--- a/setup/mscs/msc2946/msc2946.go
+++ b/setup/mscs/msc2946/msc2946.go
@@ -730,7 +730,7 @@ func stripped(ev gomatrixserverlib.PDU) *fclient.MSC2946StrippedEvent {
 		Type:           ev.Type(),
 		StateKey:       *ev.StateKey(),
 		Content:        ev.Content(),
-		Sender:         ev.Sender(),
+		Sender:         ev.SenderID(),
 		OriginServerTS: ev.OriginServerTS(),
 	}
 }