diff --git a/ChangeLog b/ChangeLog
index 4632cf1bde..a130196c97 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,4 +1,7 @@
-Thu Jul 11 20:18:08 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+Thu Jul 11 20:18:13 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* ext/dl/win32/lib/win32/registry.rb (Win32::Registry::API#make_wstr):
+	  remove workaround to append WCHAR terminator.
 
 	* transcode.c (str_encode_associate): fill terminator after conversion.
 
diff --git a/ext/dl/win32/lib/win32/registry.rb b/ext/dl/win32/lib/win32/registry.rb
index 8a5d55969e..147830ae5d 100644
--- a/ext/dl/win32/lib/win32/registry.rb
+++ b/ext/dl/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)