diff --git a/calendar/setup/tz_aliases.inc.php b/calendar/setup/tz_aliases.inc.php
index ff85188d83..e296408015 100644
--- a/calendar/setup/tz_aliases.inc.php
+++ b/calendar/setup/tz_aliases.inc.php
@@ -80,7 +80,7 @@ $tz_aliases = array(
 	'Pakistan Standard Time' => 'Asia/Karachi',
 	'Romance Standard Time' => 'Europe/Paris',
 	'Russian Standard Time' => 'Europe/Moscow',
-	'SA Eastern Standard Time' => 'America/Buenos_Aires',
+	'SA Eastern Standard Time' => 'America/Argentina/Buenos_Aires',
 	'SA Pacific Standard Time' => 'America/Bogota',
 	'SA Western Standard Time' => 'America/La_Paz',
 	'SE Asia Standard Time' => 'Asia/Bangkok',