diff --git a/ChangeLog b/ChangeLog
index c925ae7adf..a79898f14c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed Dec  5 04:04:02 2012  Masaya Tarui  <tarui@ruby-lang.org>
+
+	* test/ruby/test_thread.rb (test_async_interrupt_blocking): bugfix
+	  about defared check
+
 Wed Dec  5 03:35:37 2012  Masaya Tarui  <tarui@ruby-lang.org>
 
 	* vm_core.h (RUBY_VM_CHECK_INTS_BLOCKING): check async queue everytime.
diff --git a/test/ruby/test_thread.rb b/test/ruby/test_thread.rb
index 52ac8980a7..bff34b3b25 100644
--- a/test/ruby/test_thread.rb
+++ b/test/ruby/test_thread.rb
@@ -565,7 +565,7 @@ class TestThread < Test::Unit::TestCase
   end
   
   def test_async_interrupt_blocking
-    r=:ok
+    r=:ng
     e=Class.new(Exception)
     th_s = Thread.current
     begin
@@ -573,6 +573,7 @@ class TestThread < Test::Unit::TestCase
         Thread.async_interrupt_timing(Object => :on_blocking){
           begin
             Thread.current.raise RuntimeError
+            r=:ok
             sleep
           ensure
             th_s.raise e