diff --git a/app/mailers/topic_mailer.rb b/app/mailers/topic_mailer.rb
index 1e09bad5a..e4b75fbca 100644
--- a/app/mailers/topic_mailer.rb
+++ b/app/mailers/topic_mailer.rb
@@ -1,6 +1,8 @@
 # encoding: utf-8
 class TopicMailer < BaseMailer
   def notify_reply(recipient, topic, reply)
+    @topic = topic
+    @reply = reply
     @reply_author = reply.user
     mail(:to => recipient.email, :subject => "[#{Setting.app_name}] 主題回覆通知： #{topic.title}")
   end