diff --git a/ChangeLog b/ChangeLog
index 156c3adf21..239c20c774 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sun Aug 15 16:14:31 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* lib/mkmf.rb (Logging.postpone): close @log only when it's available.
+
 Sun Aug 15 13:30:35 2010  Kenta Murata  <mrkn@mrkn.jp>
 
 	* ext/bigdecimal/bigdecimal.h (VpVtoD): fix a type of e.
diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index 819cada514..5e347a7dbc 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -278,7 +278,7 @@ module Logging
       begin
         log.print(open {yield})
       ensure
-        @log.close
+        @log.close if @log
         File::open(tmplog) {|t| FileUtils.copy_stream(t, log)}
         @log, @logfile, @orgout, @orgerr = log, *save
         @postpone -= 1