diff --git a/src/tun_if.c b/src/tun_if.c
index 175bc7c8..98f1a421 100644
--- a/src/tun_if.c
+++ b/src/tun_if.c
@@ -142,7 +142,7 @@ struct tun_if* tun_init(struct UASYNC* ua, struct utun_config* config)
         return NULL;
     }
 
-    int mtu = config->global.mtu > 0 ? config->global.mtu : TUN_MTU_DEFAULT;
+    int mtu = TUN_MTU_DEFAULT;
 
     if (!test_mode) {
         if (tun_platform_init(tun, tun->ifname, ip_str, mtu) != 0) {