diff --git a/app/blueprints/api/v1/weapon_key_blueprint.rb b/app/blueprints/api/v1/weapon_key_blueprint.rb
index e83d8ea..0604f3e 100644
--- a/app/blueprints/api/v1/weapon_key_blueprint.rb
+++ b/app/blueprints/api/v1/weapon_key_blueprint.rb
@@ -10,7 +10,7 @@ module Api
         }
       end
 
-      fields :slug, :series, :slot, :group, :order
+      fields :granblue_id, :slug, :series, :slot, :group, :order
     end
   end
 end