diff --git a/lib/tasks/wechat.rake b/lib/tasks/wechat.rake
index bbba9994c..dd02f9209 100644
--- a/lib/tasks/wechat.rake
+++ b/lib/tasks/wechat.rake
@@ -1,5 +1,6 @@
 #coding=utf-8
 #
+require 'uglifier'
 
 def compress(srcs, outfile)
   wechat_path = File.join(Rails.root, "public", "javascripts", "wechat")