diff --git a/po/ja.po b/po/ja.po
index d8673aa95..186de8b54 100644
--- a/po/ja.po
+++ b/po/ja.po
@@ -1300,7 +1300,7 @@ msgstr "8 月"
 
 #: js/messages.php:154
 msgid "September"
-msgstr ""
+msgstr "9 月"
 
 #: js/messages.php:155
 msgid "October"