diff --git a/ChangeLog b/ChangeLog
index d92c88c32a..1a14d1377b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Wed Dec 24 09:35:11 2014  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* ext/fiddle/extconf.rb: remove ffitarget.h generated by configure on
+	  mswin, because it's not normal file (cygwin's symlink) and have
+	  system attribute.
+
 Wed Dec 24 05:40:52 2014  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* tool/downloader.rb: support ruby 1.8.
diff --git a/ext/fiddle/extconf.rb b/ext/fiddle/extconf.rb
index 3b885d2ff0..ca5fc35496 100644
--- a/ext/fiddle/extconf.rb
+++ b/ext/fiddle/extconf.rb
@@ -78,6 +78,9 @@ begin
     system(*args, chdir: libffi.dir) or
       raise "failed to configure libffi. Please install libffi."
   end
+  if $mswin && File.file?("#{libffi.include}/ffitarget.h")
+    FileUtils.rm_f("#{libffi.include}/ffitarget.h")
+  end
   unless File.file?("#{libffi.include}/ffitarget.h")
     FileUtils.cp("#{srcdir}/src/x86/ffitarget.h", libffi.include, preserve: true)
   end