diff --git a/ChangeLog b/ChangeLog
index 833e367c43..20e502e480 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Thu Jun 12 23:30:11 2008  Yusuke Endoh  <mame@tsg.ne.jp>
+
+	* thread.c (mutex_unlock): fix cond_notified consistency.
+
 Thu Jun 12 22:19:45 2008  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* thread_win32.c (native_sleep): fixed previous commit.
diff --git a/thread.c b/thread.c
index 9454f84aca..73adab4b4c 100644
--- a/thread.c
+++ b/thread.c
@@ -2579,6 +2579,7 @@ mutex_unlock(mutex_t *mutex)
 	    /* waiting thread */
 	    native_cond_signal(&mutex->cond);
 	    mutex->cond_waiting--;
+	    mutex->cond_notified++;
 	}
     }