diff --git a/serial.go b/serial.go
index 331db34..c4a06d2 100644
--- a/serial.go
+++ b/serial.go
@@ -6,6 +6,8 @@
 
 package serial // import "go.bug.st/serial.v1"
 
+//go:generate go run extras/mksyscall_windows.go -output syscall_windows.go serial_windows.go
+
 // Port is the interface for a serial Port
 type Port interface {
 	// SetMode sets all parameters of the serial port
diff --git a/serial_windows.go b/serial_windows.go
index 68f7f76..b66842c 100644
--- a/serial_windows.go
+++ b/serial_windows.go
@@ -23,8 +23,6 @@ type windowsPort struct {
 	handle syscall.Handle
 }
 
-//go:generate go run extras/mksyscall_windows.go -output syscall_windows.go serial_windows.go
-
 //sys regEnumValue(key syscall.Handle, index uint32, name *uint16, nameLen *uint32, reserved *uint32, class *uint16, value *uint16, valueLen *uint32) (regerrno error) = advapi32.RegEnumValueW
 
 func nativeGetPortsList() ([]string, error) {