diff --git a/po/sl.po b/po/sl.po
index 844f8571f..ea05130c6 100644
--- a/po/sl.po
+++ b/po/sl.po
@@ -821,7 +821,7 @@ msgstr "avgust"
 
 #: js/messages.php:91
 msgid "September"
-msgstr ""
+msgstr "september"
 
 #: js/messages.php:92
 #, fuzzy