diff --git a/common/protocol/http/sniff.go b/common/protocol/http/sniff.go
index 79ac4ad1..340164f0 100644
--- a/common/protocol/http/sniff.go
+++ b/common/protocol/http/sniff.go
@@ -3,6 +3,7 @@ package http
 import (
 	"bytes"
 	"errors"
+	"net"
 	"strings"
 
 	"v2ray.com/core/common"