diff --git a/lib/net/wisunb.js b/lib/net/wisunb.js
index 8e43a0c..34684f3 100644
--- a/lib/net/wisunb.js
+++ b/lib/net/wisunb.js
@@ -277,7 +277,7 @@ EchonetLiteNetWisunb.prototype.startDiscovery = function(buf, callback) {
 		callback = function() {};
 	}
 	this.is_discovering = true;
-	this._activeScan((err) => {
+	this._activeScan(buf, (err) => {
 		if(err) {
 			callback(err);
 		} else {
@@ -294,7 +294,7 @@ EchonetLiteNetWisunb.prototype.startDiscovery = function(buf, callback) {
 };
 
 // Start the active scan
-EchonetLiteNetWisunb.prototype._activeScan = function(callback) {
+EchonetLiteNetWisunb.prototype._activeScan = function(buf, callback) {
 	this._setSerialCallback((res) => {
 		if(res.match(/(^|\r\n)FAIL/)) {
 			var msg = 'Failed the active scan: ' + this._getFailLine(res);
@@ -317,7 +317,7 @@ EchonetLiteNetWisunb.prototype._activeScan = function(callback) {
 				}, this.SERIAL_SEND_INTERVAL);
 			} else {
 				this.discovery_timer_id = setTimeout(() => {
-					this.startDiscovery(callback);
+					this.startDiscovery(buf, callback);
 				}, this.SERIAL_SEND_INTERVAL);
 			}
 		}