diff --git a/po/bg.po b/po/bg.po
index 0be91fe7f6..44bee45073 100644
--- a/po/bg.po
+++ b/po/bg.po
@@ -1394,7 +1394,7 @@ msgstr "сб"
 #. l10n: Column header for week of the year in calendar
 #: js/messages.php:226
 msgid "Wk"
-msgstr ""
+msgstr "Сед"
 
 #: js/messages.php:228
 msgid "Hour"