diff --git a/PC/winreg.c b/PC/winreg.c
--- a/PC/winreg.c
+++ b/PC/winreg.c
@@ -1122,7 +1122,7 @@
 * nul. RegEnumKeyEx requires a 257 character buffer to
 * retrieve such a key name. */
 wchar_t tmpbuf[257];
- DWORD len = sizeof(tmpbuf); /* includes NULL terminator */
+ DWORD len = sizeof(tmpbuf)/sizeof(wchar_t); /* includes NULL terminator */
 
 if (!PyArg_ParseTuple(args, "Oi:EnumKey", &obKey, &index))
 return NULL;
</div><div class="naked_ctrl">
<form action="/index.cgi/contrast" method="get" name="gate">
<p><a href="http://altstyle.alfasado.net">AltStyle</a> によって変換されたページ <a href="https://bugs.python.org/file25092/winreg.patch">(-&gt;オリジナル)</a>
/ <label>アドレス: <input type="text" name="naked_post_url" value="https://bugs.python.org/file25092/winreg.patch" size="22" /></label> <label>モード: <select name="naked_post_mode">
<option value="default">デフォルト</option>
<option value="speech">音声ブラウザ</option>
<option value="ruby">ルビ付き</option>
<option value="contrast" selected="selected">配色反転</option>
<option value="larger-text">文字拡大</option>
<option value="mobile">モバイル</option>
</select>
<input type="submit" value="表示" />
</p>
</form>
</div>