diff --git a/ChangeLog b/ChangeLog
index 40ed6a8a8f..c48b937bdf 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,4 +1,7 @@
-Sun Feb 13 09:56:36 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+Sun Feb 13 09:56:40 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* test/io/nonblock/test_flush.rb (TestIONonblock#flush_test):
+	 return true to finish the test.
 
 	* test/syck/test_string.rb (Syck::TestString#test_non_binary_string):
 	 use assert_not instead of refute, unless required minitest
diff --git a/test/io/nonblock/test_flush.rb b/test/io/nonblock/test_flush.rb
index 5dc55a67fe..b031c71bf8 100644
--- a/test/io/nonblock/test_flush.rb
+++ b/test/io/nonblock/test_flush.rb
@@ -41,5 +41,6 @@ class TestIONonblock < Test::Unit::TestCase
       assert_nothing_raised {t.join}
     }
     assert_equal(4097, result.size)
+    true
   end
 end if IO.method_defined?(:nonblock)