diff --git a/ChangeLog b/ChangeLog
index 8f61e5cebe..976f88c449 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Tue Mar  1 22:02:35 2011  Shota Fukumori  <sorah@tubusu.net>
+
+	* lib/test/unit/parallel.rb: Fix number.
+
 Tue Mar  1 21:48:22 2011  Shota Fukumori  <sorah@tubusu.net>
 
 	* lib/test/unit/parallel.rb: For Windows.
diff --git a/lib/test/unit/parallel.rb b/lib/test/unit/parallel.rb
index c278746544..18035a4d55 100644
--- a/lib/test/unit/parallel.rb
+++ b/lib/test/unit/parallel.rb
@@ -13,7 +13,7 @@ module Test
       undef run
 
       def inclement_io orig
-        *rest, io = 500.times.inject([orig.dup]){|ios, | ios << ios.last.dup }
+        *rest, io = 32.times.inject([orig.dup]){|ios, | ios << ios.last.dup }
         rest.each(&:close)
         io
       end