diff --git a/ChangeLog b/ChangeLog
index 58f54dc968..a50a159a43 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Mon Jun 28 03:12:03 2010  Yusuke Endoh  <mame@tsg.ne.jp>
+
+	* bootstraptest/test_class.rb: add a test for [ruby-core:30843].
+
 Mon Jun 28 02:43:35 2010  Yusuke Endoh  <mame@tsg.ne.jp>
 
 	* class.c (rb_mod_init_copy): when class is dup'ed, a metaclass of the
diff --git a/bootstraptest/test_class.rb b/bootstraptest/test_class.rb
index a7f6d4df47..664dd2f166 100644
--- a/bootstraptest/test_class.rb
+++ b/bootstraptest/test_class.rb
@@ -150,3 +150,10 @@ assert_match /::C\z/, %q{
   Module.new{|m| c = class m::C; name; end}
   c
 }, '[ruby-dev:38456]'
+
+assert_normal_exit %q{
+  s = Symbol.dup
+  class << s
+  end
+  s.allocate.to_s
+}, '[ruby-core:30843]'