diff --git a/webserver/docker_ldap/tasks/main.yml b/webserver/docker_ldap/tasks/main.yml
index 6c250ac0a17316a7c6aa3c45a31408d92a969a82..9a603ab1f95c8e26e3915e3b6caf5edf4d3b8e5d 100644
--- a/webserver/docker_ldap/tasks/main.yml
+++ b/webserver/docker_ldap/tasks/main.yml
@@ -50,8 +50,8 @@
       LDAP_READONLY_USER_USERNAME: readonly
       LDAP_READONLY_USER_PASSWORD: "{{ ldap_readonly_pass }}"
     ports:
-      - {{ ldap_ip_ext }}:389:389
-      - {{ ldap_ip_ext }}:636:636
+      - "{{ ldap_ip_ext }}:389:389"
+      - "{{ ldap_ip_ext }}:636:636"
 
 - name: start phpldapadmin docker
   docker_container: