diff --git a/po/ja.po b/po/ja.po
index 7cc0b0ed4..acdc0a281 100644
--- a/po/ja.po
+++ b/po/ja.po
@@ -1356,7 +1356,7 @@ msgstr "9 月"
 #. l10n: Short month name
 #: js/messages.php:179 libraries/common.lib.php:1586
 msgid "Oct"
-msgstr ""
+msgstr "10 月"
 
 #. l10n: Short month name
 #: js/messages.php:181 libraries/common.lib.php:1588