diff --git a/switch/src/handle/tun_handler.rs b/switch/src/handle/tun_handler.rs
index e14200f..3248503 100644
--- a/switch/src/handle/tun_handler.rs
+++ b/switch/src/handle/tun_handler.rs
@@ -148,9 +148,10 @@ pub async fn handler_start<F>(
 ) where
     F: FnOnce() + Send + 'static,
 {
-     #[cfg(target_os = "linux")]
-     use std::os::unix::io::AsRawFd;
-     #[cfg(target_os = "macos")]
+    #[cfg(target_os = "linux")]
+    use std::os::unix::io::AsRawFd;
+    #[cfg(target_os = "macos")]
+    use std::os::fd::AsRawFd;
     let raw_fd = tun_reader.0.as_raw_fd();
     tokio::spawn(async move {
         let _ = status_watch.changed().await;