diff --git a/lib/LdapValidator.js b/lib/LdapValidator.js
index e84918c..480f6e0 100644
--- a/lib/LdapValidator.js
+++ b/lib/LdapValidator.js
@@ -17,7 +17,7 @@ LdapValidator.prototype.validate = function (username, password, callback) {
     if(!up) return callback();
 
     // AD will bind and delay an error till later if no password is given
-    if(password === '') return callback();
+    if(!password) return callback();
 
     var client = this._options.binder || ldap.createClient({
       url:             this._options.url,