diff --git a/Casks/wechat.rb b/Casks/wechat.rb
index 691e5faa2..ea41189ca 100644
--- a/Casks/wechat.rb
+++ b/Casks/wechat.rb
@@ -4,6 +4,7 @@ class Wechat < Cask
 
   url 'http://dldir1.qq.com/foxmail/Mac/WeChat-en_US.dmg'
   homepage 'http://weixin.qq.com/cgi-bin/readtemplate?t=mac'
+  license :unknown
 
   app 'WeChat.app'
 end