diff --git a/transport/internet/sockopt_linux.go b/transport/internet/sockopt_linux.go
index 10cc6dda..a86f7367 100644
--- a/transport/internet/sockopt_linux.go
+++ b/transport/internet/sockopt_linux.go
@@ -4,7 +4,7 @@ import "syscall"
 
 func applySocketOptions(fd uintptr, config *SocketConfig) error {
 	if config.Mark != 0 {
-		if err := syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_MARK, config.Mark); err != nil {
+		if err := syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_MARK, int(config.Mark)); err != nil {
 			return err
 		}
 	}