diff --git a/nac3standalone/demo/check_demos.sh b/nac3standalone/demo/check_demos.sh
index ca275588..f9ba67b8 100755
--- a/nac3standalone/demo/check_demos.sh
+++ b/nac3standalone/demo/check_demos.sh
@@ -4,7 +4,9 @@ set -e
 
 for demo in src/*.py; do
     echo "checking $demo..."
-    diff -Nau <(./interpret_demo.py $demo) <(./run_demo.sh $demo)
+    ./interpret_demo.py $demo > interpreted.log
+    ./run_demo.sh $demo > run.log
+    diff -Nau interpreted.log run.log
 done
 
 echo "PASSED"