diff --git a/usb_winusb.go b/usb_winusb.go
index 3304688..6c1dc54 100644
--- a/usb_winusb.go
+++ b/usb_winusb.go
@@ -12,6 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+//go:build windows
 // +build windows
 
 package main
@@ -34,26 +35,28 @@ var device struct {
 	mtx sync.Mutex
 }
 
-func (e C.DWORD) Error() string {
+type C_DWORD C.ulong
+
+func (e C_DWORD) Error() string {
 	return fmt.Sprintf("Windows Error: 0x%x", uint(e))
 }
 
 const (
-	SUCCESS                 C.DWORD = C.ERROR_SUCCESS
-	ERROR_INVALID_STATE     C.DWORD = C.ERROR_INVALID_STATE
-	ERROR_INVALID_HANDLE    C.DWORD = C.ERROR_INVALID_HANDLE
-	ERROR_INVALID_PARAMETER C.DWORD = C.ERROR_INVALID_PARAMETER
-	ERROR_OUTOFMEMORY       C.DWORD = C.ERROR_OUTOFMEMORY
-	ERROR_GEN_FAILURE       C.DWORD = C.ERROR_GEN_FAILURE
-	ERROR_OBJECT_NOT_FOUND  C.DWORD = C.ERROR_OBJECT_NOT_FOUND
-	ERROR_NOT_SUPPORTED     C.DWORD = C.ERROR_NOT_SUPPORTED
-	ERROR_SHARING_VIOLATION C.DWORD = C.ERROR_SHARING_VIOLATION
-	ERROR_BAD_COMMAND       C.DWORD = C.ERROR_BAD_COMMAND
+	SUCCESS                 C_DWORD = C.ERROR_SUCCESS
+	ERROR_INVALID_STATE     C_DWORD = C.ERROR_INVALID_STATE
+	ERROR_INVALID_HANDLE    C_DWORD = C.ERROR_INVALID_HANDLE
+	ERROR_INVALID_PARAMETER C_DWORD = C.ERROR_INVALID_PARAMETER
+	ERROR_OUTOFMEMORY       C_DWORD = C.ERROR_OUTOFMEMORY
+	ERROR_GEN_FAILURE       C_DWORD = C.ERROR_GEN_FAILURE
+	ERROR_OBJECT_NOT_FOUND  C_DWORD = C.ERROR_OBJECT_NOT_FOUND
+	ERROR_NOT_SUPPORTED     C_DWORD = C.ERROR_NOT_SUPPORTED
+	ERROR_SHARING_VIOLATION C_DWORD = C.ERROR_SHARING_VIOLATION
+	ERROR_BAD_COMMAND       C_DWORD = C.ERROR_BAD_COMMAND
 )
 
-func winusbError(err error) error {
-	if err != SUCCESS {
-		return err
+func winusbError(err C.ulong) error {
+	if err != C.ERROR_SUCCESS {
+		return C_DWORD(err)
 	}
 	return nil
 }
diff --git a/versioninfo_windows.go b/versioninfo_windows.go
index f48c664..d557679 100644
--- a/versioninfo_windows.go
+++ b/versioninfo_windows.go
@@ -12,6 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-go:generate goversioninfo -64
+// go:generate goversioninfo -64
 
 package main