diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog
index ee62ec99e..312ba6db4 100644
--- a/winsup/cygwin/ChangeLog
+++ b/winsup/cygwin/ChangeLog
@@ -1,3 +1,7 @@
+Wed Nov 29 18:25:53 2000  Kazuhiro Fujieda  <fujieda@jaist.ac.jp>
+
+	* cygheap.cc (chgheap_root::operator =): Check root dir properly.
+
 Thu Nov 29 18:11:00 2000  Corinna Vinschen <corinna@vinschen.de>
 
 	* net.cc (cygwin_inet_aton): Return nonzero if the address
diff --git a/winsup/cygwin/cygheap.cc b/winsup/cygwin/cygheap.cc
index 0d720e9d5..697827b85 100644
--- a/winsup/cygwin/cygheap.cc
+++ b/winsup/cygwin/cygheap.cc
@@ -305,7 +305,7 @@ cygheap_root::operator =(const char *new_root)
     {
       root = cstrdup (new_root);
       rootlen = strlen (root);
-      if (rootlen > 1 && root[rootlen - 1] == '/')
+      if (rootlen >= 1 && root[rootlen - 1] == '/')
 	root[--rootlen] = '\0';
       if (!rootlen)
 	{