diff --git a/ChangeLog b/ChangeLog
index ff69f6fb6b..6ca28e67c4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed Dec 10 15:01:19 2003  Shugo Maeda  <shugo@ruby-lang.org>
+
+	* test/monitor/test_monitor.rb (test_cond): use Queue#deq
+	insteadof sleep.
+
 Wed Dec 10 14:45:39 2003  WATANABE Hirofumi  <eban@ruby-lang.org>
 
 	* ext/pty/pty.c (HAVE_SYS_IOCTL_H): already defined at config.h, so
diff --git a/test/monitor/test_monitor.rb b/test/monitor/test_monitor.rb
index 658c838be6..b539cb3cca 100644
--- a/test/monitor/test_monitor.rb
+++ b/test/monitor/test_monitor.rb
@@ -113,8 +113,9 @@ class TestMonitor < Test::Unit::TestCase
     end
 
     c = "foo"
+    queue3 = Queue.new
     Thread.start do
-      sleep(0.2)
+      queue3.deq
       @monitor.synchronize do
         c = "bar"
         cond.signal
@@ -125,6 +126,7 @@ class TestMonitor < Test::Unit::TestCase
       result3 = cond.wait(0.1)
       assert_equal(false, result3)
       assert_equal("foo", c)
+      queue3.enq(nil)
       result4 = cond.wait
       assert_equal(true, result4)
       assert_equal("bar", c)