diff --git a/tasks/shinyproxy_docker_service.yml b/tasks/shinyproxy_docker_service.yml
index 5ceb553..6a247c2 100644
--- a/tasks/shinyproxy_docker_service.yml
+++ b/tasks/shinyproxy_docker_service.yml
@@ -27,7 +27,7 @@
     file: dest={{ shinyproxy_as_docker_src_dir }} state=directory
 
   - name: Install the shinyproxy configuration file
-    template: src=shinyproxy-2-conf.yml.j2 dest={{ shinyproxy_as_docker_src_dir }}/application.yml owner=root group=root mode=0444
+    template: src=shinyproxy-2-conf.yml.j2 dest={{ shinyproxy_as_docker_src_dir }}/application.yml owner=root group=root mode='0400'
 
   when:
     - shinyproxy_container_backend == 'docker-swarm'