diff --git a/ChangeLog b/ChangeLog
index 1b53a44a7b..7c4ddecbba 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Wed Apr 28 22:26:55 2010  Yusuke Endoh  <mame@tsg.ne.jp>
+
+	* test/psych/visitors/test_yaml_tree.rb (test_struct_const): remove
+	  Struct::Foo which affects test/ruby/test_struct to warn redefining
+	  constant.
+
 Wed Apr 28 18:04:48 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* time.c (time_timespec): use rb_check_funcall.
diff --git a/test/psych/visitors/test_yaml_tree.rb b/test/psych/visitors/test_yaml_tree.rb
index 292710b00d..758cfaed72 100644
--- a/test/psych/visitors/test_yaml_tree.rb
+++ b/test/psych/visitors/test_yaml_tree.rb
@@ -23,6 +23,7 @@ module Psych
       def test_struct_const
         foo = Struct.new("Foo", :bar)
         assert_cycle foo.new('bar')
+        Struct.instance_eval { remove_const(:Foo) }
       end
 
       A = Struct.new(:foo)