diff --git a/hostid_darwin.go b/hostid_darwin.go
index abd0684..08351ff 100644
--- a/hostid_darwin.go
+++ b/hostid_darwin.go
@@ -2,8 +2,8 @@
 
 package xid
 
-import "golang.org/x/sys/unix"
+import "syscall"
 
 func readPlatformMachineID() (string, error) {
-	return unix.Sysctl("kern.uuid")
+	return syscall.Sysctl("kern.uuid")
 }
diff --git a/hostid_freebsd.go b/hostid_freebsd.go
index df2bd13..be25a03 100644
--- a/hostid_freebsd.go
+++ b/hostid_freebsd.go
@@ -2,8 +2,8 @@
 
 package xid
 
-import "golang.org/x/sys/unix"
+import "syscall"
 
 func readPlatformMachineID() (string, error) {
-	return unix.Sysctl("kern.hostuuid")
+	return syscall.Sysctl("kern.hostuuid")
 }
diff --git a/hostid_windows.go b/hostid_windows.go
index b8e1c2c..ec2593e 100644
--- a/hostid_windows.go
+++ b/hostid_windows.go
@@ -4,32 +4,31 @@ package xid
 
 import (
 	"fmt"
+	"syscall"
 	"unsafe"
-
-	"golang.org/x/sys/windows"
 )
 
 func readPlatformMachineID() (string, error) {
-	// source: https://github.com/shirou/gopsutil/blob/master/host/host_windows.go
-	var h windows.Handle
-	err := windows.RegOpenKeyEx(windows.HKEY_LOCAL_MACHINE, windows.StringToUTF16Ptr(`SOFTWARE\Microsoft\Cryptography`), 0, windows.KEY_READ|windows.KEY_WOW64_64KEY, &h)
+	// source: https://github.com/shirou/gopsutil/blob/master/host/host_syscall.go
+	var h syscall.Handle
+	err := syscall.RegOpenKeyEx(syscall.HKEY_LOCAL_MACHINE, syscall.StringToUTF16Ptr(`SOFTWARE\Microsoft\Cryptography`), 0, syscall.KEY_READ|syscall.KEY_WOW64_64KEY, &h)
 	if err != nil {
 		return "", err
 	}
-	defer windows.RegCloseKey(h)
+	defer syscall.RegCloseKey(h)
 
-	const windowsRegBufLen = 74 // len(`{`) + len(`abcdefgh-1234-456789012-123345456671` * 2) + len(`}`) // 2 == bytes/UTF16
+	const syscallRegBufLen = 74 // len(`{`) + len(`abcdefgh-1234-456789012-123345456671` * 2) + len(`}`) // 2 == bytes/UTF16
 	const uuidLen = 36
 
-	var regBuf [windowsRegBufLen]uint16
-	bufLen := uint32(windowsRegBufLen)
+	var regBuf [syscallRegBufLen]uint16
+	bufLen := uint32(syscallRegBufLen)
 	var valType uint32
-	err = windows.RegQueryValueEx(h, windows.StringToUTF16Ptr(`MachineGuid`), nil, &valType, (*byte)(unsafe.Pointer(&regBuf[0])), &bufLen)
+	err = syscall.RegQueryValueEx(h, syscall.StringToUTF16Ptr(`MachineGuid`), nil, &valType, (*byte)(unsafe.Pointer(&regBuf[0])), &bufLen)
 	if err != nil {
 		return "", err
 	}
 
-	hostID := windows.UTF16ToString(regBuf[:])
+	hostID := syscall.UTF16ToString(regBuf[:])
 	hostIDLen := len(hostID)
 	if hostIDLen != uuidLen {
 		return "", fmt.Errorf("HostID incorrect: %q\n", hostID)