diff --git a/ChangeLog b/ChangeLog
index 460d37c49b..ae65b586e9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Thu Mar 22 18:17:36 2001  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* eval.c (rb_mod_nesting): should not include Object at the
+	  toplevel.
+
 Thu Mar 22 17:43:44 2001  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
 	* ruby.h: better inline function support.
diff --git a/eval.c b/eval.c
index fd7c3dde30..63ad891534 100644
--- a/eval.c
+++ b/eval.c
@@ -1467,7 +1467,7 @@ rb_mod_nesting()
     NODE *cbase = RNODE(ruby_frame->cbase);
     VALUE ary = rb_ary_new();
 
-    while (cbase) {
+    while (cbase && cbase->nd_next) {
 	rb_ary_push(ary, cbase->nd_clss);
 	cbase = cbase->nd_next;
     }