diff --git a/lib/ldap_login/login.rb b/lib/ldap_login/login.rb
index 51c0734..6e80bc4 100644
--- a/lib/ldap_login/login.rb
+++ b/lib/ldap_login/login.rb
@@ -1,4 +1,5 @@
 module LdapLogin::Login
+  require 'net/ldap'
   LDAP_ADSERVER=["ad.asia.edu.tw","ad2.asia.edu.tw","ad3.asia.edu.tw"]
   def ldap_login_auth(user,request,session,flash,params)
     LDAP_ADSERVER=["ad.asia.edu.tw","ad2.asia.edu.tw","ad3.asia.edu.tw"]