diff --git a/tests/file-mirror b/tests/file-mirror
index d24092d..b0388bb 100644
--- a/tests/file-mirror
+++ b/tests/file-mirror
@@ -5,6 +5,9 @@ if [ ! -e /mmdebstrap-testenv ]; then
 	echo "this test requires the cache directory to be mounted on /mnt and should only be run inside a container" >&2
 	exit 1
 fi
-{{ CMD }} --mode={{ MODE }} --variant=apt --setup-hook='mkdir -p "$1"/mnt/cache/debian; mount -o ro,bind /mnt/cache/debian "$1"/mnt/cache/debian' --customize-hook='umount "$1"/mnt/cache/debian; rmdir "$1"/mnt/cache/debian "$1"/mnt/cache' {{ DIST }} /tmp/debian-chroot.tar "deb file:///mnt/cache/debian {{ DIST }} main"
+{{ CMD }} --mode={{ MODE }} --variant=apt \
+	--setup-hook='mkdir -p "$1"/mnt/cache/debian; mount -o ro,bind /mnt/cache/debian "$1"/mnt/cache/debian' \
+	--customize-hook='umount "$1"/mnt/cache/debian; rmdir "$1"/mnt/cache/debian "$1"/mnt/cache' \
+	{{ DIST }} /tmp/debian-chroot.tar "deb file:///mnt/cache/debian {{ DIST }} main"
 tar -tf /tmp/debian-chroot.tar | sort | diff -u tar1.txt -
 rm /tmp/debian-chroot.tar