diff --git a/nac3standalone/demo/check_demo.sh b/nac3standalone/demo/check_demo.sh
index 31fbbacf..bcf9a69f 100755
--- a/nac3standalone/demo/check_demo.sh
+++ b/nac3standalone/demo/check_demo.sh
@@ -17,3 +17,5 @@ echo -n "Checking $demo... "
 diff -Nau interpreted.log run.log
 diff -Nau interpreted.log run_lli.log
 echo "ok"
+
+rm -f interpreted.log run.log run_lli.log