diff --git a/lib/net/upnp.js b/lib/net/upnp.js
index 2c8a2897..c1357b04 100644
--- a/lib/net/upnp.js
+++ b/lib/net/upnp.js
@@ -505,11 +505,12 @@ UPNPService.prototype.getExternalIP = co(function* () {
 /**
  * Attempt to add port mapping to local IP.
  * @param {String} remote - Remote IP.
- * @param {Number} port - Local and remote port.
+ * @param {Number} src - Remote port.
+ * @param {Number} dest - Local port.
  * @returns {Promise}
  */
 
-UPNPService.prototype.addPortMapping = co(function* (remote, port) {
+UPNPService.prototype.addPortMapping = co(function* (remote, src, dest) {
   var action = 'AddPortMapping';
   var local = UPNP.getLocalIP();
   var xml, child;
@@ -519,10 +520,10 @@ UPNPService.prototype.addPortMapping = co(function* (remote, port) {
 
   xml = yield this.soapRequest(action, [
     ['NewRemoteHost', remote],
-    ['NewExternalPort', port],
+    ['NewExternalPort', src],
     ['NewProtocol', 'TCP'],
     ['NewInternalClient', local],
-    ['NewInternalPort', port],
+    ['NewInternalPort', dest],
     ['NewEnabled', 'True'],
     ['NewPortMappingDescription', 'upnp:bcoin'],
     ['NewLeaseDuration', 0]
@@ -539,7 +540,7 @@ UPNPService.prototype.addPortMapping = co(function* (remote, port) {
 /**
  * Attempt to remove port mapping from local IP.
  * @param {String} remote - Remote IP.
- * @param {Number} port - Local and remote port.
+ * @param {Number} port - Remote port.
  * @returns {Promise}
  */