diff --git a/main/json/config_json.go b/main/json/config_json.go
index 8f55b5853..fb89358a1 100644
--- a/main/json/config_json.go
+++ b/main/json/config_json.go
@@ -5,6 +5,7 @@ package json
 import (
 	"io"
 	"os"
+
 	"v2ray.com/core"
 	"v2ray.com/core/common"
 	"v2ray.com/core/common/cmdarg"