diff --git a/nac3standalone/demo/check_demo.sh b/nac3standalone/demo/check_demo.sh
index bcf9a69..85e5e99 100755
--- a/nac3standalone/demo/check_demo.sh
+++ b/nac3standalone/demo/check_demo.sh
@@ -7,15 +7,19 @@ if [ -z "$1" ]; then
   exit 1
 fi
 
-demo="${@:-1}"
-set -- "${@:1:$(($# - 1))}"
+declare -a nac3args
+while [ $# -gt 1 ]; do
+  nac3args+=("$1")
+  shift
+done
+demo="$1"
 
 echo -n "Checking $demo... "
 ./interpret_demo.py "$demo" > interpreted.log
-./run_demo.sh "$@" "$demo" > run.log
-./run_demo_lli.sh "$@" "$demo" > run_lli.log
+./run_demo.sh "${nac3args[@]}" "$demo" > run.log
+./run_demo_lli.sh "${nac3args[@]}" "$demo" > run_lli.log
 diff -Nau interpreted.log run.log
 diff -Nau interpreted.log run_lli.log
 echo "ok"
 
-rm -f interpreted.log run.log run_lli.log
+rm -f interpreted.log run.log run_lli.log
\ No newline at end of file