diff --git a/ChangeLog b/ChangeLog
index 3b2597d29e..9e57d8500e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Fri Jan  2 23:51:41 2009  Yusuke Endoh  <mame@tsg.ne.jp>
+
+	* test/ruby/test_sleep.rb (test_sleep_5sec): stop gc.
+
 Fri Jan  2 23:36:10 2009  Tanaka Akira  <akr@fsij.org>
 
 	* ext/socket/socket.c: don't apply socktype hack [ruby-core:184] for
diff --git a/test/ruby/test_sleep.rb b/test/ruby/test_sleep.rb
index 675fdc9747..adc4876216 100644
--- a/test/ruby/test_sleep.rb
+++ b/test/ruby/test_sleep.rb
@@ -2,9 +2,12 @@ require 'test/unit'
 
 class TestSleep < Test::Unit::TestCase
   def test_sleep_5sec
+    GC.disable
     start = Time.now
     sleep 5
     slept = Time.now-start
     assert_in_delta(5.0, slept, 0.1, "[ruby-core:18015]: longer than expected")
+  ensure
+    GC.enable
   end
 end