diff --git a/ChangeLog b/ChangeLog
index c4dbe53ce7..58d0dcad5b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed Oct 17 11:04:48 2012  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* test/ruby/test_hash.rb (TestHash#test_dup_equality): added a new test
+	  to show the problem of r37232.
+
 Wed Oct 17 10:48:40 2012  Shugo Maeda  <shugo@ruby-lang.org>
 
 	* vm_insnhelper.c (vm_search_method): fix a build error that occurs 
diff --git a/test/ruby/test_hash.rb b/test/ruby/test_hash.rb
index 1806746ef2..f1eef88d99 100644
--- a/test/ruby/test_hash.rb
+++ b/test/ruby/test_hash.rb
@@ -325,6 +325,15 @@ class TestHash < Test::Unit::TestCase
     end
   end
 
+  def test_dup_equality
+    h = {'k' => 'v'}
+    assert_equal(h, h.dup)
+    h1 = {h => 1}
+    assert_equal(h1, h1.dup)
+    h[1] = 2
+    assert_equal(h1, h1.dup)
+  end
+
   def test_each
     count = 0
     @cls[].each { |k, v| count + 1 }