diff --git a/livekitlib b/livekitlib
index 650ac41..c5b0764 100644
--- a/livekitlib
+++ b/livekitlib
@@ -456,7 +456,7 @@ union_append_bundles()
    debug_log "union_append_bundles" "$*"
    echo_green_star
    echo "Adding bundles to union"
-   ls -1 "$1" | grep '.'$BEXT'$' | sort | while read BUNDLE; do
+   ls -1 "$1" | grep '.'$BEXT'$' | sort -n | while read BUNDLE; do
       echo "* $BUNDLE"
       mkdir -p "$2/$BUNDLE"
       mount -o loop -t squashfs "$1/$BUNDLE" "$2/$BUNDLE"