diff --git a/helpers/make-firefox b/helpers/make-firefox
index 057d176..9571bc2 100644
--- a/helpers/make-firefox
+++ b/helpers/make-firefox
@@ -20,7 +20,7 @@
 #
 
 VERSION=123
-EXTERNAL='deb-src http://ppa.launchpadcontent.net/mozillateam/ppa/ubuntu noble main'
+EXTERNAL='deb-src http://ppa.launchpadcontent.net/mozillateam/ppa/ubuntu $UPSTREAM main'
 REPOKEY=9BDB3D89CE49EC21
 
 . ./config