diff --git a/src/tuntap/iface.go b/src/tuntap/iface.go
index f1ca0ad..633903d 100644
--- a/src/tuntap/iface.go
+++ b/src/tuntap/iface.go
@@ -9,8 +9,6 @@ import (
 	"github.com/Arceliar/phony"
 )
 
-const TUN_OFFSET_BYTES = 4
-
 type tunWriter struct {
 	phony.Inbox
 	tun *TunAdapter
diff --git a/src/tuntap/tun_bsd.go b/src/tuntap/tun_bsd.go
index 219e348..79184cb 100644
--- a/src/tuntap/tun_bsd.go
+++ b/src/tuntap/tun_bsd.go
@@ -15,6 +15,8 @@ import (
 	wgtun "golang.zx2c4.com/wireguard/tun"
 )
 
+const TUN_OFFSET_BYTES = 0
+
 const SIOCSIFADDR_IN6 = (0x80000000) | ((288 & 0x1fff) << 16) | uint32(byte('i'))<<8 | 12
 
 type in6_addrlifetime struct {
diff --git a/src/tuntap/tun_darwin.go b/src/tuntap/tun_darwin.go
index cf2fbfb..4dab6f3 100644
--- a/src/tuntap/tun_darwin.go
+++ b/src/tuntap/tun_darwin.go
@@ -15,6 +15,8 @@ import (
 	wgtun "golang.zx2c4.com/wireguard/tun"
 )
 
+const TUN_OFFSET_BYTES = 0
+
 // Configures the "utun" adapter with the correct IPv6 address and MTU.
 func (tun *TunAdapter) setup(ifname string, addr string, mtu int) error {
 	if ifname == "auto" {
diff --git a/src/tuntap/tun_linux.go b/src/tuntap/tun_linux.go
index 4206b26..ca40252 100644
--- a/src/tuntap/tun_linux.go
+++ b/src/tuntap/tun_linux.go
@@ -9,6 +9,8 @@ import (
 	wgtun "golang.zx2c4.com/wireguard/tun"
 )
 
+const TUN_OFFSET_BYTES = 0
+
 // Configures the TUN adapter with the correct IPv6 address and MTU.
 func (tun *TunAdapter) setup(ifname string, addr string, mtu int) error {
 	if ifname == "auto" {
diff --git a/src/tuntap/tun_other.go b/src/tuntap/tun_other.go
index 8a27f57..85934f3 100644
--- a/src/tuntap/tun_other.go
+++ b/src/tuntap/tun_other.go
@@ -9,6 +9,8 @@ import (
 	wgtun "golang.zx2c4.com/wireguard/tun"
 )
 
+const TUN_OFFSET_BYTES = 0
+
 // Configures the TUN adapter with the correct IPv6 address and MTU.
 func (tun *TunAdapter) setup(ifname string, addr string, mtu int) error {
 	iface, err := wgtun.CreateTUN(ifname, mtu)
diff --git a/src/tuntap/tun_windows.go b/src/tuntap/tun_windows.go
index 9b5f7b0..e611af7 100644
--- a/src/tuntap/tun_windows.go
+++ b/src/tuntap/tun_windows.go
@@ -2,6 +2,8 @@
 
 package tuntap
 
+// This is to catch Windows platforms
+
 import (
 	"bytes"
 	"errors"
@@ -16,7 +18,7 @@ import (
 	"golang.zx2c4.com/wireguard/windows/tunnel/winipcfg"
 )
 
-// This is to catch Windows platforms
+const TUN_OFFSET_BYTES = 4
 
 // Configures the TUN adapter with the correct IPv6 address and MTU.
 func (tun *TunAdapter) setup(ifname string, addr string, mtu int) error {