diff --git a/roles/wsgi_website/tasks/main.yml b/roles/wsgi_website/tasks/main.yml
index fe209f64ee1b645efb3f75e4bc807c9c62441fc1..db710f93cb9b7fe11f84823340dd2f8548b84729 100644
--- a/roles/wsgi_website/tasks/main.yml
+++ b/roles/wsgi_website/tasks/main.yml
@@ -300,7 +300,7 @@
   #   This specific task is used in order to work around inability of Ansible
   #   to provide properly parametrised handlers for reusable roles.
   set_fact:
-    wsgi_services_to_restart: "{{ wsgi_services_to_restart + [ fqdn ] }}"
+    wsgi_services_to_restart: "{{ wsgi_services_to_restart + [fqdn] }}"
   when: |
     fqdn not in wsgi_services_to_restart and
     ((install_extra_packages is defined and install_extra_packages.changed) or