diff --git a/ChangeLog b/ChangeLog
index 6700e1f6f0..e85b40b4d5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Thu Jun  6 00:30:04 2013  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* win32/win32.c (NET_LUID): define it on MinGW32.
+	  mingw-w64 has NET_LUID but mingw32 (mingw.org) still doesn't have
+	  NET_LUID. reported by taco on IRC
+
 Thu Jun  6 00:05:08 2013  Akinori MUSHA  <knu@iDaemons.org>
 
 	* string.c (String#b): Allow code range scan to happen later so
diff --git a/win32/win32.c b/win32/win32.c
index b7eb4c62f2..25d94ff429 100644
--- a/win32/win32.c
+++ b/win32/win32.c
@@ -3763,7 +3763,7 @@ str2guid(const char *str, GUID *guid)
 }
 
 /* License: Ruby's */
-#if !defined(_IFDEF_) && !defined(__MINGW32__)
+#if !defined(_IFDEF_) && !defined(__MINGW64__)
     typedef struct {
 	uint64_t Value;
 	struct {