diff --git a/enumerator/enumerator.go b/enumerator/enumerator.go
index b72a72f..918db57 100644
--- a/enumerator/enumerator.go
+++ b/enumerator/enumerator.go
@@ -6,6 +6,8 @@
 
 package enumerator // import "go.bug.st/serial.v1/enumerator"
 
+//go:generate go run ../extras/mksyscall_windows.go -output syscall_windows.go usb_windows.go
+
 // PortDetails contains detailed information about USB serial port.
 // Use GetDetailedPortsList function to retrieve it.
 type PortDetails struct {
diff --git a/enumerator/usb_windows.go b/enumerator/usb_windows.go
index 1431deb..12ded68 100644
--- a/enumerator/usb_windows.go
+++ b/enumerator/usb_windows.go
@@ -54,8 +54,6 @@ func parseDeviceID(deviceID string, details *PortDetails) {
 // setupapi based
 // --------------
 
-//go:generate go run ../extras/mksyscall_windows.go -output syscall_windows.go usb_windows.go
-
 //sys setupDiClassGuidsFromNameInternal(class string, guid *guid, guidSize uint32, requiredSize *uint32) (err error) = setupapi.SetupDiClassGuidsFromNameW
 //sys setupDiGetClassDevs(guid *guid, enumerator *string, hwndParent uintptr, flags uint32) (set devicesSet, err error) = setupapi.SetupDiGetClassDevsW
 //sys setupDiDestroyDeviceInfoList(set devicesSet) (err error) = setupapi.SetupDiDestroyDeviceInfoList