diff --git a/src/boot/sysobj.reb b/src/boot/sysobj.reb
index 4e2068dcce..6ee3e72c2c 100644
--- a/src/boot/sysobj.reb
+++ b/src/boot/sysobj.reb
@@ -262,7 +262,7 @@ modules: object [
 	thru-cache:       https://src.rebol.tech/modules/thru-cache.reb
 	to-ascii:         https://src.rebol.tech/modules/to-ascii.reb
 	unicode-utils:    https://src.rebol.tech/modules/unicode-utils.reb
-	upgrade:          https://src.rebol.tech/modules/upgrade.red
+	upgrade:          https://src.rebol.tech/modules/upgrade.reb
 	daytime:          https://src.rebol.tech/mezz/prot-daytime.reb
 	mail:             https://src.rebol.tech/mezz/prot-mail.reb
 	mysql:            https://src.rebol.tech/mezz/prot-mysql.reb
diff --git a/src/modules/upgrade.reb b/src/modules/upgrade.reb
index 00e2275478..5aa7ae3717 100644
--- a/src/modules/upgrade.reb
+++ b/src/modules/upgrade.reb
@@ -20,5 +20,5 @@ upgrade: function [
 	try [delete system/options/modules/upgrade.reb] 
 	try [unset in system/contexts/user 'upgrade]
 	try [unset in system/contexts/lib  'upgrade]
-	system/modules/upgrade: https://src.rebol.tech/modules/upgrade.red
+	system/modules/upgrade: https://src.rebol.tech/modules/upgrade.reb
 ]