diff --git a/po/sl.po b/po/sl.po
index cc0d986a42..1af64d290f 100644
--- a/po/sl.po
+++ b/po/sl.po
@@ -1240,7 +1240,7 @@ msgstr "ne"
 #. l10n: Minimal week day name
 #: js/messages.php:150
 msgid "Mo"
-msgstr "Po"
+msgstr "po"
 
 #. l10n: Minimal week day name
 #: js/messages.php:152