diff --git a/app/models/ruling_bus_info.rb b/app/models/ruling_bus_info.rb
index c4021a9..2fe09b5 100644
--- a/app/models/ruling_bus_info.rb
+++ b/app/models/ruling_bus_info.rb
@@ -14,7 +14,7 @@ class RulingBusInfo
   field :hint, type: String, default: "", localize: true
 
   def locale
-    self.locale || I18n.locale.to_s.capitalize
+    super() || I18n.locale.to_s.capitalize
   end
   def monitor_point_show(locale=nil)
     locale = self.class.get_locale if locale.nil?