diff --git a/ChangeLog b/ChangeLog
index 23b954a211..1c51e40924 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Thu Mar 25 23:53:22 2010  wanabe  <s.wanabe@gmail.com>
+
+	* thread.c (thread_reset_event_flags): set flags to thread.
+
 Thu Mar 25 23:17:16 2010  Yusuke Endoh  <mame@tsg.ne.jp>
 
 	* file.c (rb_get_path_check): prefer #to_path over #to_str.  a patch
diff --git a/thread.c b/thread.c
index a3dfe007b2..a94b81569b 100644
--- a/thread.c
+++ b/thread.c
@@ -3702,6 +3702,7 @@ thread_reset_event_flags(rb_thread_t *th)
 	flag |= hook->flag;
 	hook = hook->next;
     }
+    th->event_flags = flag;
 }
 
 static void