diff --git a/modules/addon/lang/jp.lang.php b/modules/addon/lang/jp.lang.php
index f2e94f110..087519f3e 100644
--- a/modules/addon/lang/jp.lang.php
+++ b/modules/addon/lang/jp.lang.php
@@ -5,7 +5,7 @@
      * @brief  日本語言語パッケージ
      **/
 
-    $lang->addon = "アドオン";
+    $lang->addon = 'アドオン';
 
     $lang->addon_info = 'アドオン情報';
     $lang->addon_maker = 'アドオン作者';