diff --git a/localedata/locales/id_ID b/localedata/locales/id_ID
index 16aba52999..17cb3c77ca 100644
--- a/localedata/locales/id_ID
+++ b/localedata/locales/id_ID
@@ -122,7 +122,7 @@ t_fmt       "%T"
 am_pm       "AM";"PM"
 t_fmt_ampm  "%I:%M:%S %p"
 week 7;19971130;1
-first_weekday 2
+first_weekday 1
 END LC_TIME
 
 LC_MESSAGES