diff --git a/win32/win32.c b/win32/win32.c
index 7b42df096f..25d94ff429 100644
--- a/win32/win32.c
+++ b/win32/win32.c
@@ -3763,7 +3763,7 @@ str2guid(const char *str, GUID *guid)
 }
 
 /* License: Ruby's */
-#ifndef HAVE_TYPE_NET_LUID
+#if !defined(_IFDEF_) && !defined(__MINGW64__)
     typedef struct {
 	uint64_t Value;
 	struct {