diff --git a/src/bin/main.rs b/src/bin/main.rs
index e690f6c..0ed98c7 100644
--- a/src/bin/main.rs
+++ b/src/bin/main.rs
@@ -1,4 +1,3 @@
-use tun::DEFAULT_MTU as MTU;
 use tun2proxy::{Args, BoxError};
 
 fn main() -> Result<(), BoxError> {
@@ -50,7 +49,7 @@ async fn main_async(args: Args) -> Result<(), BoxError> {
             }
             unsafe { tun2proxy::tun2proxy_set_traffic_status_callback(1, Some(traffic_cb), std::ptr::null_mut()) };
 
-            if let Err(err) = tun2proxy::general_run_async(args, MTU, false, shutdown_token).await {
+            if let Err(err) = tun2proxy::general_run_async(args, tun::DEFAULT_MTU, cfg!(target_os = "macos"), shutdown_token).await {
                 log::error!("main loop error: {}", err);
             }
         }