diff --git a/ChangeLog b/ChangeLog
index 3ea758a48f..e3899974a8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Fri Jul 12 18:10:46 2013  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* ext/fiddle/win32/lib/win32/registry.rb
+	  (Win32::Registry::API#make_wstr): same as r41922.
+
 Fri Jul 12 16:28:37 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* encoding.c (rb_enc_associate_index): refill the terminator if it
diff --git a/ext/fiddle/win32/lib/win32/registry.rb b/ext/fiddle/win32/lib/win32/registry.rb
index b3a9531679..330596f8dd 100644
--- a/ext/fiddle/win32/lib/win32/registry.rb
+++ b/ext/fiddle/win32/lib/win32/registry.rb
@@ -267,7 +267,7 @@ For detail, see the MSDN[http://msdn.microsoft.com/library/en-us/sysinfo/base/pr
       end
 
       def make_wstr(str)
-        str.encode(WCHAR) + WCHAR_NUL
+        str.encode(WCHAR)
       end
 
       def OpenKey(hkey, name, opt, desired)