diff --git a/ChangeLog b/ChangeLog
index 72818c93a1..b9ad004826 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Tue Jun 22 21:33:23 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* test/optparse/test_summary.rb: fixed superclass so that it run
+	  solely.
+
 Tue Jun 22 19:57:33 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* parse.y (shadowing_lvar_gen): should add lvar to vars and
diff --git a/test/optparse/test_summary.rb b/test/optparse/test_summary.rb
index 12744a8a7b..0c67d7f0f9 100644
--- a/test/optparse/test_summary.rb
+++ b/test/optparse/test_summary.rb
@@ -1,8 +1,6 @@
-require 'test/unit'
-require 'optparse'
+require_relative 'test_optparse'
 
-class TestOptionParser < Test::Unit::TestCase; end
-class TestOptionParser::SummaryTest < Test::Unit::TestCase
+class TestOptionParser::SummaryTest < TestOptionParser
   def test_short_clash
     r = nil
     o = OptionParser.new do |opts|