diff --git a/live-build/functions b/live-build/functions
index a07fff55..d17e846d 100644
--- a/live-build/functions
+++ b/live-build/functions
@@ -642,7 +642,7 @@ snap_preseed() {
     # downside is that each time a snap is added the seed must be valid,
     # i.e. snaps with bases need to add bases first etc.
     if [ -e chroot/var/lib/snapd/seed/seed.yaml ]; then
-        snap debug validate-seed chroot/var/lib/snapd/seed/seed.yaml
+        snap debug validate-seed "$CHROOT_ROOT/var/lib/snapd/seed/seed.yaml"
     fi
 }