diff --git a/clientapi/routing/joinroom.go b/clientapi/routing/joinroom.go
index 8c77f749d..74b6a93ce 100644
--- a/clientapi/routing/joinroom.go
+++ b/clientapi/routing/joinroom.go
@@ -81,7 +81,7 @@ func JoinRoomByIDOrAlias(
 		defer close(done)
 		rsAPI.PerformJoin(req.Context(), &joinReq, &joinRes)
 		if joinRes.Error != nil {
-			joinRes.Error.Code = roomserverAPI.PerformErrorNotAllowed
+			joinRes.Error.RemoteCode = http.StatusForbidden
 			done <- joinRes.Error.JSONResponse()
 		} else {
 			done <- util.JSONResponse{