diff --git a/nac3standalone/demo/check_demos.sh b/nac3standalone/demo/check_demos.sh
index 1c32cbe58..d7fa8b169 100755
--- a/nac3standalone/demo/check_demos.sh
+++ b/nac3standalone/demo/check_demos.sh
@@ -6,7 +6,7 @@ count=0
 for demo in src/*.py; do
     echo -n "checking $demo... "
     ./interpret_demo.py $demo > interpreted.log
-    ./run_demo.sh $demo > run.log
+    ./run_demo.sh "$@" $demo > run.log
     diff -Nau interpreted.log run.log
     echo "ok"
     let "count+=1"