diff --git a/tun/tun_linux.go b/tun/tun_linux.go
index dc44399..a2e64b6 100644
--- a/tun/tun_linux.go
+++ b/tun/tun_linux.go
@@ -1,7 +1,9 @@
 package tun
 
 import (
+	"errors"
 	"io"
+	"net"
 
 	"github.com/songgao/water"
 )