diff --git a/engine/engine.go b/engine/engine.go
index 5ed5228..a68b0aa 100644
--- a/engine/engine.go
+++ b/engine/engine.go
@@ -14,6 +14,7 @@ import (
 	"github.com/xjasonlyu/tun2socks/v2/proxy"
 	"github.com/xjasonlyu/tun2socks/v2/stats"
 	"github.com/xjasonlyu/tun2socks/v2/tunnel"
+
 	"gopkg.in/yaml.v3"
 )