diff --git a/ChangeLog b/ChangeLog
index dc363a1e70..dd3f268d4b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -2,6 +2,8 @@ Fri Apr 19 16:22:55 2002  WATANABE Hirofumi  <eban@ruby-lang.org>
 
 	* ext/socket/extconf.rb: include <windows.h>, <winsock.h> on _WIN32.
 
+	* win32/win32.c: include <mswsock.h> on __MINGW32__.
+
 Fri Apr 19 14:57:44 2002  Nobuyoshi Nakada  <nobu.nakada@nifty.ne.jp>
 
 	* re.c (rb_reg_to_s): remove redundant shy group.
diff --git a/win32/win32.c b/win32/win32.c
index 01e824baab..d5717d6683 100644
--- a/win32/win32.c
+++ b/win32/win32.c
@@ -24,6 +24,9 @@
 #include <windows.h>
 #include <winbase.h>
 #include <wincon.h>
+#ifdef __MINGW32__
+#include <mswsock.h>
+#endif
 #include "win32.h"
 #include "win32/dir.h"
 #ifndef index