diff --git a/tasks/main.yml b/tasks/main.yml
index b5bd7b6..1640fdf 100644
--- a/tasks/main.yml
+++ b/tasks/main.yml
@@ -200,7 +200,7 @@
     mode: u=rw,g=r,o=r
     owner: root
     group: root
-  with_items: {{ reverse_proxy_additional_certificates }}
+  with_items: "{{ reverse_proxy_additional_certificates }}"
   notify:
     - restart apache2
 
@@ -213,7 +213,7 @@
     mode: u=rw,g=r,o=
     owner: root
     group: root
-  with_items: {{ reverse_proxy_additional_certificates }}
+  with_items: "{{ reverse_proxy_additional_certificates }}"
   notify:
     - restart apache2
 
@@ -221,7 +221,7 @@
   template:
     src: "cert_template.conf"
     dest: /etc/apache2/certs-conf/cert_{{ item.name }}.conf
-  with_items: {{ reverse_proxy_additional_certificates }}
+  with_items: "{{ reverse_proxy_additional_certificates }}"
   notify:
     - restart apache2