diff --git a/pkgs/build-support/upstream-updater/update-walker-service-specific.sh b/pkgs/build-support/upstream-updater/update-walker-service-specific.sh
index b66001073f27..fe439c5d11e3 100644
--- a/pkgs/build-support/upstream-updater/update-walker-service-specific.sh
+++ b/pkgs/build-support/upstream-updater/update-walker-service-specific.sh
@@ -9,7 +9,7 @@ SF_version_dir () {
 }
 
 SF_version_tarball () {
-  version_link '[.]tar[.].*/download$'
+  version_link "${1:-[.]tar[.]}.*/download\$"
 }
 
 GH_latest () {