diff --git a/ChangeLog b/ChangeLog
index 590b46d4f0..a375f24504 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Tue Mar  6 11:53:25 2007  Hidetoshi NAGAI  <nagai@ai.kyutech.ac.jp>
+
+	* ext/tk/sample/irbtkw.rbw: fails to exit process.
+
 Mon Mar  5 20:14:49 2007  Akinori MUSHA  <knu@iDaemons.org>
 
 	* time.c (time_to_s): Correct the wrong format which did not
diff --git a/ext/tk/sample/irbtkw.rbw b/ext/tk/sample/irbtkw.rbw
index 92fa5692f2..f6a35be6ed 100644
--- a/ext/tk/sample/irbtkw.rbw
+++ b/ext/tk/sample/irbtkw.rbw
@@ -26,7 +26,11 @@ console.yscrollbar(TkScrollbar.new(top, :width=>10).pack(:before=>console,
                                                          :side=>:right, 
                                                          :expand=>false, 
                                                          :fill=>:y))
-ev_loop = Thread.new{Tk.mainloop}
+irb_thread = nil
+ev_loop = Thread.new{
+  Tk.mainloop
+  irb_thread.kill if irb_thread
+}
 
 # window position control
 root = Tk.root
@@ -116,4 +120,5 @@ console.bind('Control-c'){
 irb_thread.join
 
 # exit
+ev_thread.kill
 Tk.exit