diff --git a/xorriso-dd-target/xorriso-dd-target b/xorriso-dd-target/xorriso-dd-target
index ab735678..25f8816a 100755
--- a/xorriso-dd-target/xorriso-dd-target
+++ b/xorriso-dd-target/xorriso-dd-target
@@ -246,7 +246,8 @@ xdt_predict_su_power() {
   elif test -n "$xdt_with_sudo"
   then
     echo "Testing sudo to possibly get password prompting done now:" >&2
-    if sudo "$xdt_lsblk_cmd" -h >/dev/null
+    local test_sudo=sudo
+    if "$test_sudo" "$xdt_lsblk_cmd" -h >/dev/null
     then
       echo "sudo $xdt_lsblk_cmd seems ok." >&2
       echo >&2