diff --git a/tasks/install.yml b/tasks/install.yml
index c4a9c28..419e240 100644
--- a/tasks/install.yml
+++ b/tasks/install.yml
@@ -48,7 +48,7 @@
       name: "{{ item.flag }}"
       state: present
       rules: "-A INPUT -m state --state NEW -p {{ item.proto }} --dport {{ item.port }} -j ACCEPT"
-    with_items: {{ unifi_open_ports }}
+    with_items: "{{ unifi_open_ports }}"
     when: unifi_iptables_enabled
 
   - name: Create systemd unit files