diff --git a/transport/internet/sockopt_unix.go b/transport/internet/sockopt_darwin.go
similarity index 83%
rename from transport/internet/sockopt_unix.go
rename to transport/internet/sockopt_darwin.go
index bfc5a992a..7fb5eafec 100644
--- a/transport/internet/sockopt_unix.go
+++ b/transport/internet/sockopt_darwin.go
@@ -1,5 +1,3 @@
-// +build darwin dragonfly freebsd netbsd openbsd
-
 package internet
 
 import (
@@ -8,14 +6,16 @@ import (
 )
 
 const (
-	TCP_FASTOPEN = 0x105
+	TCP_FASTOPEN        = 0x105
+	TCP_FASTOPEN_SERVER = 0x01
+	TCP_FASTOPEN_CLIENT = 0x02
 )
 
 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, 1); err != nil {
+			if err := syscall.SetsockoptInt(int(fd), syscall.IPPROTO_TCP, TCP_FASTOPEN, TCP_FASTOPEN_CLIENT); err != nil {
 				return err
 			}
 		case SocketConfig_Disable:
@@ -32,7 +32,7 @@ func applyInboundSocketOptions(network string, fd uintptr, config *SocketConfig)
 	if strings.HasPrefix(network, "tcp") {
 		switch config.Tfo {
 		case SocketConfig_Enable:
-			if err := syscall.SetsockoptInt(int(fd), syscall.IPPROTO_TCP, TCP_FASTOPEN, 1); err != nil {
+			if err := syscall.SetsockoptInt(int(fd), syscall.IPPROTO_TCP, TCP_FASTOPEN, TCP_FASTOPEN_SERVER); err != nil {
 				return err
 			}
 		case SocketConfig_Disable:
diff --git a/transport/internet/sockopt_other.go b/transport/internet/sockopt_other.go
index 7a1266652..8a3b03326 100644
--- a/transport/internet/sockopt_other.go
+++ b/transport/internet/sockopt_other.go
@@ -1,4 +1,4 @@
-// +build js
+// +build js dragonfly freebsd netbsd openbsd
 
 package internet