diff --git a/ChangeLog b/ChangeLog
index b2885331cd..500cd93355 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Fri Aug 29 00:19:54 2008  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* win32/win32.c (set_pioinfo_extra): use MSVCRT's open() and close().
+
 Fri Aug 29 00:03:13 2008  Yusuke Endoh  <mame@tsg.ne.jp>
 
 	* file.c (file_expand_path): check invalid access.
diff --git a/win32/win32.c b/win32/win32.c
index 8827f3b593..7d5fbda63a 100644
--- a/win32/win32.c
+++ b/win32/win32.c
@@ -1715,13 +1715,13 @@ set_pioinfo_extra(void)
 {
     int fd;
 
-    fd = open("NUL", O_RDONLY);
+    fd = _open("NUL", O_RDONLY);
     for (pioinfo_extra = 0; pioinfo_extra <= 64; pioinfo_extra += sizeof(void *)) {
 	if (_osfhnd(fd) == _get_osfhandle(fd)) {
 	    break;
 	}
     }
-    close(fd);
+    _close(fd);
 
     if (pioinfo_extra > 64) {
 	/* not found, maybe something wrong... */