diff --git a/Scripts/developer_scripts/Bundle_polyhedron_demo_with_appimage.sh b/Scripts/developer_scripts/Bundle_polyhedron_demo_with_appimage.sh
index 815ca57f302..dde1f1a2773 100644
--- a/Scripts/developer_scripts/Bundle_polyhedron_demo_with_appimage.sh
+++ b/Scripts/developer_scripts/Bundle_polyhedron_demo_with_appimage.sh
@@ -1,5 +1,5 @@
 #!/bin/bash
-if [ "$1" == '--help' ]; then
+if [ "$1" == '--help' -o ! -d "$1" -o ! -d "$2" ]; then
   echo "Usage: $0 <path to CGAL release> <path to output> <number of cores to dedicate>"
   echo "Builds and packages the Polyhedron demo form the CGAL dir."
   exit 0