diff --git a/roles/setup_http_site_proxy/tasks/main.yml b/roles/setup_http_site_proxy/tasks/main.yml
index b4b241f..c1f52d2 100644
--- a/roles/setup_http_site_proxy/tasks/main.yml
+++ b/roles/setup_http_site_proxy/tasks/main.yml
@@ -3,7 +3,7 @@
   template:
     src: templates/apache-docker-proxy-site.j2
     dest: /etc/apache2/sites-available/{{ site_name }}.conf
-    mode: 0644
+    mode: "0644"
   notify: restart apache2
 
 - name: Activate Apache2 site