diff --git a/transport/internet/sockopt_linux_test.go b/transport/internet/sockopt_linux_test.go
new file mode 100644
index 000000000..1d2cfc4ce
--- /dev/null
+++ b/transport/internet/sockopt_linux_test.go
@@ -0,0 +1,48 @@
+package internet_test
+
+import (
+	"context"
+	"syscall"
+	"testing"
+
+	"v2ray.com/core/common"
+	"v2ray.com/core/common/net"
+	"v2ray.com/core/testing/servers/tcp"
+	. "v2ray.com/core/transport/internet"
+)
+
+func TestSockOptMark(t *testing.T) {
+	t.Skip("requires CAP_NET_ADMIN")
+
+	tcpServer := tcp.Server{
+		MsgProcessor: func(b []byte) []byte {
+			return b
+		},
+	}
+	dest, err := tcpServer.Start()
+	common.Must(err)
+	defer tcpServer.Close()
+
+	const mark = 1
+	ctx := context.Background()
+	ctx = ContextWithStreamSettings(ctx, &MemoryStreamConfig{
+		SocketSettings: &SocketConfig{
+			Mark: mark,
+		},
+	})
+	dialer := DefaultSystemDialer{}
+	conn, err := dialer.Dial(ctx, nil, dest)
+	common.Must(err)
+	defer conn.Close()
+
+	rawConn, err := conn.(*net.TCPConn).SyscallConn()
+	common.Must(err)
+	err = rawConn.Control(func(fd uintptr) {
+		m, err := syscall.GetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_MARK)
+		common.Must(err)
+		if mark != m {
+			t.Fatal("unexpected conneciton mark", m, " want ", mark)
+		}
+	})
+	common.Must(err)
+}
diff --git a/transport/internet/sockopt_test.go b/transport/internet/sockopt_test.go
index 504c6a208..13487b7a7 100644
--- a/transport/internet/sockopt_test.go
+++ b/transport/internet/sockopt_test.go
@@ -2,13 +2,11 @@ package internet_test
 
 import (
 	"context"
-	"syscall"
 	"testing"
 
 	"v2ray.com/core/common"
 	"v2ray.com/core/common/buf"
 	"v2ray.com/core/common/compare"
-	"v2ray.com/core/common/net"
 	"v2ray.com/core/testing/servers/tcp"
 	. "v2ray.com/core/transport/internet"
 )
@@ -43,39 +41,3 @@ func TestTCPFastOpen(t *testing.T) {
 		t.Fatal(err)
 	}
 }
-
-func TestSockOptMark(t *testing.T) {
-	t.Skip("requires CAP_NET_ADMIN")
-
-	tcpServer := tcp.Server{
-		MsgProcessor: func(b []byte) []byte {
-			return b
-		},
-	}
-	dest, err := tcpServer.Start()
-	common.Must(err)
-	defer tcpServer.Close()
-
-	const mark = 1
-	ctx := context.Background()
-	ctx = ContextWithStreamSettings(ctx, &MemoryStreamConfig{
-		SocketSettings: &SocketConfig{
-			Mark: mark,
-		},
-	})
-	dialer := DefaultSystemDialer{}
-	conn, err := dialer.Dial(ctx, nil, dest)
-	common.Must(err)
-	defer conn.Close()
-
-	rawConn, err := conn.(*net.TCPConn).SyscallConn()
-	common.Must(err)
-	err = rawConn.Control(func(fd uintptr) {
-		m, err := syscall.GetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_MARK)
-		common.Must(err)
-		if mark != m {
-			t.Fatal("unexpected conneciton mark", m, " want ", mark)
-		}
-	})
-	common.Must(err)
-}
diff --git a/transport/internet/sockopt_unix.go b/transport/internet/sockopt_unix.go
index c5e768a7c..bfc5a992a 100644
--- a/transport/internet/sockopt_unix.go
+++ b/transport/internet/sockopt_unix.go
@@ -8,21 +8,18 @@ import (
 )
 
 const (
-	// For incoming connections.
-	TCP_FASTOPEN = 23
-	// For out-going connections.
-	TCP_FASTOPEN_CONNECT = 30
+	TCP_FASTOPEN = 0x105
 )
 
 func applyOutboundSocketOptions(network string, address string, fd uintptr, config *SocketConfig) error {
 	if strings.HasPrefix(network, "tcp") {
 		switch config.Tfo {
 		case SocketConfig_Enable:
-			if err := syscall.SetsockoptInt(int(fd), syscall.IPPROTO_TCP, TCP_FASTOPEN_CONNECT, 1); err != nil {
+			if err := syscall.SetsockoptInt(int(fd), syscall.IPPROTO_TCP, TCP_FASTOPEN, 1); err != nil {
 				return err
 			}
 		case SocketConfig_Disable:
-			if err := syscall.SetsockoptInt(int(fd), syscall.IPPROTO_TCP, TCP_FASTOPEN_CONNECT, 0); err != nil {
+			if err := syscall.SetsockoptInt(int(fd), syscall.IPPROTO_TCP, TCP_FASTOPEN, 0); err != nil {
 				return err
 			}
 		}