diff --git a/setup.sh b/setup.sh
index f869c86..e996d23 100644
--- a/setup.sh
+++ b/setup.sh
@@ -112,6 +112,10 @@ function select_part () {
     if we_have_exactly_one_part "${part_type}" "${parts}"; then
         part="${parts}"
     else
+        if [[ "${part_type}" == 'zfs' ]]; then
+            2> printf -- '%s\n' 'We have more than one ZFS (BF00) partition to pick for installation. Cowardly exiting ...'
+            exit 77
+        fi
         printf -- '%s\n' 'Which '"${part_type^^}"' partition do you want us to use?'
         while IFS= read -r found_part; do
             enriched_parts+=("'${found_part}'"' (aka ID '"'$(get_drive_id "${found_part}")'"')')