diff --git a/netdev.go b/netdev.go
index 05150e2..95d42db 100644
--- a/netdev.go
+++ b/netdev.go
@@ -5,19 +5,19 @@ import (
 )
 
 const (
-	AF_INET       = 0x2
-	SOCK_STREAM   = 0x1
-	SOCK_DGRAM    = 0x2
-	SOL_SOCKET    = 0x1
-	SO_KEEPALIVE  = 0x9
-	SOL_TCP       = 0x6
-	TCP_KEEPINTVL = 0x5
-	IPPROTO_TCP   = 0x6
-	IPPROTO_UDP   = 0x11
+	_AF_INET       = 0x2
+	_SOCK_STREAM   = 0x1
+	_SOCK_DGRAM    = 0x2
+	_SOL_SOCKET    = 0x1
+	_SO_KEEPALIVE  = 0x9
+	_SOL_TCP       = 0x6
+	_TCP_KEEPINTVL = 0x5
+	_IPPROTO_TCP   = 0x6
+	_IPPROTO_UDP   = 0x11
 	// Made up, not a real IP protocol number.  This is used to create a
 	// TLS socket on the device, assuming the device supports mbed TLS.
-	IPPROTO_TLS = 0xFE
-	F_SETFL     = 0x4
+	_IPPROTO_TLS = 0xFE
+	_F_SETFL     = 0x4
 )
 
 // netdev is the current netdev, set by the application with useNetdev()
diff --git a/tcpsock.go b/tcpsock.go
index 25a5475..42af855 100644
--- a/tcpsock.go
+++ b/tcpsock.go
@@ -153,7 +153,7 @@ func DialTCP(network string, laddr, raddr *TCPAddr) (*TCPConn, error) {
 		return nil, fmt.Errorf("Sorry, localhost isn't available on Tinygo")
 	}
 
-	fd, err := netdev.Socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)
+	fd, err := netdev.Socket(_AF_INET, _SOCK_STREAM, _IPPROTO_TCP)
 	if err != nil {
 		return nil, err
 	}
@@ -216,12 +216,12 @@ func (c *TCPConn) SetDeadline(t time.Time) error {
 }
 
 func (c *TCPConn) SetKeepAlive(keepalive bool) error {
-	return netdev.SetSockOpt(c.fd, SOL_SOCKET, SO_KEEPALIVE, keepalive)
+	return netdev.SetSockOpt(c.fd, _SOL_SOCKET, _SO_KEEPALIVE, keepalive)
 }
 
 func (c *TCPConn) SetKeepAlivePeriod(d time.Duration) error {
 	// Units are 1/2 seconds
-	return netdev.SetSockOpt(c.fd, SOL_TCP, TCP_KEEPINTVL, 2*d.Seconds())
+	return netdev.SetSockOpt(c.fd, _SOL_TCP, _TCP_KEEPINTVL, 2*d.Seconds())
 }
 
 func (c *TCPConn) SetReadDeadline(t time.Time) error {
@@ -265,7 +265,7 @@ func (l *listener) Addr() Addr {
 }
 
 func listenTCP(laddr *TCPAddr) (Listener, error) {
-	fd, err := netdev.Socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)
+	fd, err := netdev.Socket(_AF_INET, _SOCK_STREAM, _IPPROTO_TCP)
 	if err != nil {
 		return nil, err
 	}
diff --git a/tlssock.go b/tlssock.go
index 77d0245..f4f228b 100644
--- a/tlssock.go
+++ b/tlssock.go
@@ -57,7 +57,7 @@ func DialTLS(addr string) (*TLSConn, error) {
 		port = 443
 	}
 
-	fd, err := netdev.Socket(AF_INET, SOCK_STREAM, IPPROTO_TLS)
+	fd, err := netdev.Socket(_AF_INET, _SOCK_STREAM, _IPPROTO_TLS)
 	if err != nil {
 		return nil, err
 	}
diff --git a/udpsock.go b/udpsock.go
index 9fa2054..f782c5f 100644
--- a/udpsock.go
+++ b/udpsock.go
@@ -168,7 +168,7 @@ func DialUDP(network string, laddr, raddr *UDPAddr) (*UDPConn, error) {
 		laddr.Port = ephemeralPort()
 	}
 
-	fd, err := netdev.Socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)
+	fd, err := netdev.Socket(_AF_INET, _SOCK_DGRAM, _IPPROTO_UDP)
 	if err != nil {
 		return nil, err
 	}