diff --git a/services/wolf.sh b/services/wolf.sh
index 85c6d8e..e40dd28 100644
--- a/services/wolf.sh
+++ b/services/wolf.sh
@@ -647,8 +647,13 @@ UDEV
         ((_ci++))
     done < <(lsblk -Pno NAME,MOUNTPOINT,SIZE,LABEL,UUID 2>/dev/null)
 
-    # Unmounted block devices — skip disks that have any mounted partition
-    local -a _UNMT_DEV _UNMT_LABEL _UNMT_UUID
+    # Unmounted block devices — skip disks that have any mounted partition.
+    # Explicit =() initializers, not bare `local -a` — under setup.sh's
+    # `set -u`, an array that never gets an element assigned (e.g. a laptop
+    # with no second/unmounted drive at all) can still trip "unbound
+    # variable" on later reads like ${#_UNMT_DEV[@]} below, even though it
+    # was declared with `local -a`. Confirmed live on a single-drive laptop.
+    local -a _UNMT_DEV=() _UNMT_LABEL=() _UNMT_UUID=()
     local _ui=0
     while IFS= read -r _line; do
         local _name _size _type _fstype _mnt _label