diff --git a/ChangeLog b/ChangeLog
index ff24f8fab8..bfeda548fc 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed Mar 20 00:36:43 2002  Akinori MUSHA  <knu@iDaemons.org>
+
+	* util.c (ruby_getcwd): the content of buf is uncertain and must
+	  not be printed when getcwd(buf, size) has failed.
+
 Mon Mar 18 22:19:52 2002  Nobuyoshi Nakada  <nobu.nakada@nifty.ne.jp>
 
 	* ext/stringio/stringio.c (check_modifiable): wrong declaration.
diff --git a/util.c b/util.c
index 26a35ed398..512b00b47a 100644
--- a/util.c
+++ b/util.c
@@ -642,7 +642,7 @@ ruby_getcwd()
     char *buf = xmalloc(size);
 
     while (!getcwd(buf, size)) {
-	if (errno != ERANGE) rb_sys_fail(buf);
+	if (errno != ERANGE) rb_sys_fail(NULL);
 	size *= 2;
 	buf = xrealloc(buf, size);
     }