diff --git a/po/en_GB.po b/po/en_GB.po
index cf1790faa..e7f1361a7 100644
--- a/po/en_GB.po
+++ b/po/en_GB.po
@@ -720,7 +720,7 @@ msgstr "November"
 
 #: js/messages.php:94
 msgid "December"
-msgstr ""
+msgstr "December"
 
 #. l10n: Short month name
 #: js/messages.php:98 libraries/messages.inc.php:28