diff --git a/lib/url.js b/lib/url.js
index 724cb75..6e391f1 100644
--- a/lib/url.js
+++ b/lib/url.js
@@ -15,16 +15,16 @@ module.exports = {
     if (!u.protocol || !(u.protocol === 'ldap:' || u.protocol === 'ldaps:'))
       throw new TypeError(urlStr + ' is an invalid LDAP url (protocol)');
 
-    if (!u.port) {
-      u.port = 389;
-    } else {
-      u.port = parseInt(u.port, 10);
-    }
+    u.secure = (u.protocol === 'ldaps:');
 
     if (!u.hostname)
       u.hostname = 'localhost';
 
-    u.secure = (u.protocol === 'ldaps:');
+    if (!u.port) {
+      u.port = (u.secure ? 636 : 389);
+    } else {
+      u.port = parseInt(u.port, 10);
+    }
 
     if (u.pathname) {
       u.pathname = querystring.unescape(u.pathname.substr(1));