diff --git a/src/tuntap/iface.go b/src/tuntap/iface.go
index 633903da..f1ca0add 100644
--- a/src/tuntap/iface.go
+++ b/src/tuntap/iface.go
@@ -9,6 +9,8 @@ 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 79184cb9..219e3485 100644
--- a/src/tuntap/tun_bsd.go
+++ b/src/tuntap/tun_bsd.go
@@ -15,8 +15,6 @@ 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 4dab6f31..cf2fbfb4 100644
--- a/src/tuntap/tun_darwin.go
+++ b/src/tuntap/tun_darwin.go
@@ -15,8 +15,6 @@ 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 ca402522..4206b26a 100644
--- a/src/tuntap/tun_linux.go
+++ b/src/tuntap/tun_linux.go
@@ -9,8 +9,6 @@ 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 85934f39..8a27f57b 100644
--- a/src/tuntap/tun_other.go
+++ b/src/tuntap/tun_other.go
@@ -9,8 +9,6 @@ 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 e611af76..9b5f7b0c 100644
--- a/src/tuntap/tun_windows.go
+++ b/src/tuntap/tun_windows.go
@@ -2,8 +2,6 @@
 
 package tuntap
 
-// This is to catch Windows platforms
-
 import (
 	"bytes"
 	"errors"
@@ -18,7 +16,7 @@ import (
 	"golang.zx2c4.com/wireguard/windows/tunnel/winipcfg"
 )
 
-const TUN_OFFSET_BYTES = 4
+// This is to catch Windows platforms
 
 // Configures the TUN adapter with the correct IPv6 address and MTU.
 func (tun *TunAdapter) setup(ifname string, addr string, mtu int) error {