diff --git a/tunnel/conn.go b/tunnel/conn.go
index 0484de1..d3274a6 100644
--- a/tunnel/conn.go
+++ b/tunnel/conn.go
@@ -3,7 +3,6 @@ package tunnel
 import (
 	"fmt"
 	"net"
-	"os"
 	"sync"
 	"sync/atomic"
 	"time"