diff --git a/lib/ldap_login/login.rb b/lib/ldap_login/login.rb
index 6e80bc4..1a14b91 100644
--- a/lib/ldap_login/login.rb
+++ b/lib/ldap_login/login.rb
@@ -2,7 +2,6 @@ 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"]
     ldap_hosts = LDAP_ADSERVER.shuffle
     error = ''
     ldap_user = params[:user_name]