diff --git a/internal/net/tun/tun_linux.go b/internal/net/tun/tun_linux.go
index 0efd089..a651cc4 100644
--- a/internal/net/tun/tun_linux.go
+++ b/internal/net/tun/tun_linux.go
@@ -69,7 +69,9 @@ func createTun() (*os.File, error) {
 	if errno != 0 {
 		return nil, errno
 	}
-	unix.SetNonblock(tunfd, true)
+	if err := unix.SetNonblock(tunfd, true); err != nil {
+		return nil, err
+	}
 
 	return os.NewFile(uintptr(tunfd), tunPath), nil
 }