diff --git a/udp.go b/udp.go
index 66409680..06d85789 100644
--- a/udp.go
+++ b/udp.go
@@ -3,9 +3,8 @@ package main
 import (
 	"fmt"
 	"net"
-	"time"
-
 	"sync"
+	"time"
 
 	"github.com/shadowsocks/go-shadowsocks2/socks"
 )