diff --git a/localedata/locales/eo b/localedata/locales/eo
index 6eb26f374a..49951c35da 100644
--- a/localedata/locales/eo
+++ b/localedata/locales/eo
@@ -175,7 +175,8 @@ d_t_fmt  "%a %d %b %Y %T"
 date_fmt "%a %d %b %Y %T %z"
 d_fmt   "%Y-%m-%d"
 t_fmt   "%T"
-week 7;19971130;1
+week 7;19971130;4
+first_weekday 2
 END LC_TIME
 
 LC_MESSAGES