diff --git a/ChangeLog b/ChangeLog
index fd8ed4dcb6..0ff9722311 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Tue Dec 27 22:34:54 2011  Shota Fukumori  <sorah@tubusu.net>
+
+	* lib/test/unit.rb (Worker#close): "closing IO if IO is closed"
+	  should be "closing IO if IO isn't closed"
+
 Tue Dec 27 22:04:27 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* st.c (st_update): new function to lookup the given key and
diff --git a/lib/test/unit.rb b/lib/test/unit.rb
index 9a85951b83..eb0666a0e6 100644
--- a/lib/test/unit.rb
+++ b/lib/test/unit.rb
@@ -294,7 +294,7 @@ module Test
 
         def close
           begin
-            @io.close if @io.closed?
+            @io.close unless @io.closed?
           rescue IOError; end
           self
         end