diff --git a/index.js b/index.js
index 64b8331..b49e0d8 100644
--- a/index.js
+++ b/index.js
@@ -208,6 +208,9 @@ Client.prototype._requestUdp = function (announceUrl, opts) {
   })
 
   function send (message) {
+    if(parsedUrl.port==null) {
+      parsedUrl.port=80;
+    }
     socket.send(message, 0, message.length, parsedUrl.port, parsedUrl.hostname)
   }