diff --git a/scripts/test-this-branch.sh b/scripts/test-this-branch.sh
index 3cb98440..f272732f 100755
--- a/scripts/test-this-branch.sh
+++ b/scripts/test-this-branch.sh
@@ -8,7 +8,8 @@ sudo apt install -y zsync xorriso isolinux
 
 snapcraft snap --output subiquity_test.snap
 urlbase=http://cdimage.ubuntu.com/ubuntu-server/daily-live/current
-isoname=$(distro-info -d)-live-server-$(dpkg --print-architecture).iso
+distroname=$(distro-info -d)
+isoname="${distroname}"-live-server-$(dpkg --print-architecture).iso
 zsync ${urlbase}/${isoname}.zsync
 sudo ./scripts/inject-subiquity-snap.sh ${isoname} subiquity_test.snap custom.iso