diff --git a/containers/xos/Dockerfile b/containers/xos/Dockerfile
index b10814a..639cbd5 100644
--- a/containers/xos/Dockerfile
+++ b/containers/xos/Dockerfile
@@ -80,6 +80,7 @@
     /opt/xos/scripts/opencloud genkeys
 
 # install Tosca engine
+RUN chmod +x /opt/xos/tosca/run.py
 RUN bash /opt/xos/tosca/install_tosca.sh
 
 EXPOSE 8000