diff --git a/app/assets/javascripts/locales/ja.js.erb b/app/assets/javascripts/locales/ja.js.erb
index 2bb653952a6..b258ba577d5 100644
--- a/app/assets/javascripts/locales/ja.js.erb
+++ b/app/assets/javascripts/locales/ja.js.erb
@@ -1,3 +1,7 @@
 //= depend_on 'client.ja.yml'
 //= require locales/i18n
 <%= JsLocaleHelper.output_locale(:ja) %>
+
+I18n.pluralizationRules['ja'] = function (n) {
+  return n === 0 ? ["zero", "none", "other"] : "other";
+};