diff --git a/modules/server/thread.js b/modules/server/thread.js
index 6e7532e..5d9e54f 100644
--- a/modules/server/thread.js
+++ b/modules/server/thread.js
@@ -528,7 +528,7 @@ Thread2ch.prototype = {
        }

            // レスID
-       var regResID = /( |[^A-Z])(ID:)([0-9A-Za-z\+\/]+)/g;
+       var regResID = /( |[^A-Z]|[\x81-\x9f\xe0-\xfc][A-Z])(ID:)([0-9A-Za-z\+\/]+)/g;
        resMes = resMes.replace(regResID, '$1<span class="resMesID" resID="$3"><span class="mesID_$3">$2$3</span></span>');

            // スレッドのタイトルが見つかったときは HTML ヘッダを追加して送る