diff --git a/ChangeLog b/ChangeLog
index f75e75c38c..aa00dda6e4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed Jan 30 12:30:08 2013  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
+
+	* test/ruby/test_signal.rb (test_trap_puts): Fix typo. "sync"
+	  should be "STDOUT.sync".
+
 Thu Jan 31 15:39:00 2013  Zachary Scott  <zachary@zacharyscott.net>
 
 	* string.c (rb_str_aset_m): Documentation for String#[]= fix
diff --git a/test/ruby/test_signal.rb b/test/ruby/test_signal.rb
index 3a89240f44..1de522ee2e 100644
--- a/test/ruby/test_signal.rb
+++ b/test/ruby/test_signal.rb
@@ -265,7 +265,7 @@ EOS
     assert_in_out_err([], <<-INPUT, ["a"*10000], [])
       Signal.trap(:INT) {
           # for enable internal io mutex
-          sync = false
+          STDOUT.sync = false
           # larger than internal io buffer
           print "a"*10000
       }