diff --git a/ChangeLog b/ChangeLog
index 00dd6265f7..982bcd740d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Sun May 30 21:48:07 2010  Yusuke Endoh  <mame@tsg.ne.jp>
+
+	* lib/tempfile.rb (Tempfile#unlink): leave @data.  Assigning nil to
+	  @data caused double closing error of the same IO in finalizer.  a
+	  patch from Simon Nicholls.  [ruby-core:29395]
+
 Sun May 30 18:47:15 2010  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* ext/nkf/nkf-utf8/nkf.c: updated to b856dd07.
diff --git a/lib/tempfile.rb b/lib/tempfile.rb
index c45865d7a3..54f00de2b0 100755
--- a/lib/tempfile.rb
+++ b/lib/tempfile.rb
@@ -236,7 +236,7 @@ class Tempfile < DelegateClass(File)
       end
       # remove tmpname from remover
       @data[0] = @data[2] = nil
-      @data = @tmpname = nil
+      @tmpname = nil
     rescue Errno::EACCES
       # may not be able to unlink on Windows; just ignore
     end