diff --git a/app/controllers/guests_controller.rb b/app/controllers/guests_controller.rb
index 1fa29f6..62530ce 100644
--- a/app/controllers/guests_controller.rb
+++ b/app/controllers/guests_controller.rb
@@ -12,7 +12,7 @@ class GuestsController < ApplicationController
   def index
     render json: Guest.includes(:group)
                       .left_joins(:group)
-                      .order('groups.name' => :asc, name: :asc)
+                      .order('groups.name' => :asc, invitation_id: :asc, name: :asc)
                       .as_json(GUEST_PARAMS)
   end