diff --git a/client.go b/client.go
index 0b5eb9f..d2211fa 100644
--- a/client.go
+++ b/client.go
@@ -59,7 +59,7 @@ func (q *QuicRoundTripper) RoundTrip(request *http.Request) (*http.Response, err
 	conn, exists = q.conns[hostname]
 	q.connsLock.RUnlock()
 	if !q.keepConnection || !exists {
-		conn_new, err := Dial("udp4", hostname)
+		conn_new, err := Dial("udp", hostname)
 		if err != nil {
 			fmt.Println("error occured!", err)
 			return nil, err
diff --git a/server.go b/server.go
index a7bacfb..39ad3fb 100644
--- a/server.go
+++ b/server.go
@@ -81,7 +81,7 @@ func (srv *QuicSpdyServer) ListenAndServe() error {
 		wch := make(chan UdpData, 500) // TODO(serialx, hodduc): Optimize buffer size
 		statch := make(chan statCallback, 0)
 
-		conn, err := reuseport.NewReusablePortPacketConn("udp4", addr)
+		conn, err := reuseport.NewReusablePortPacketConn("udp", addr)
 		if err != nil {
 			return err
 		}