diff --git a/box.go b/box.go
index 91e9fb9b..c64f1f8b 100644
--- a/box.go
+++ b/box.go
@@ -2,10 +2,8 @@ package box
 
 import (
 	"context"
-	"fmt"
 	"io"
 	"os"
-	"runtime/debug"
 	"time"
 
 	"github.com/sagernet/sing-box/adapter"