diff --git a/ChangeLog b/ChangeLog
index e82d2deb0e..73393a5b38 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,8 +1,10 @@
-Fri Jan 23 14:57:18 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+Fri Jan 23 15:12:52 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* lib/mkmf.rb (mkintpath): new function which converts native path
 	  to format acceptable in Makefile.
 
+	* lib/mkmf.rb (configuration): leaves PATH_SEPARATOR unchanged.
+
 	* lib/mkmf.rb (configuration): convers srcdir, topdir and hdrdir.
 	  a patch by Alexey Borzenkov <snaury AT gmail.com> at
 	  [ruby-core:21448].
diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index 9038630e2f..da84cb85cc 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -1331,8 +1331,6 @@ def configuration(srcdir)
       if CONFIG['target_os'] != 'cygwin'
         vpath = vpath.map {|p| p.sub(/.*/, '$(shell cygpath -u \&)')}
       end
-    when 'mingw32'
-      CONFIG['PATH_SEPARATOR'] = ';'
     end
   end
   CONFIG["hdrdir"] ||= $hdrdir