diff --git a/webserver/docker_hackmd/templates/docker-compose.yml b/webserver/docker_hackmd/templates/docker-compose.yml
index 6474911b808884f65e8e66d0904d04a0424b12c2..919ac4019116bc683577a4ed69619a161eb27d57 100644
--- a/webserver/docker_hackmd/templates/docker-compose.yml
+++ b/webserver/docker_hackmd/templates/docker-compose.yml
@@ -16,7 +16,7 @@ services:
       CMD_ALLOW_ANONYMOUS: "true"
       CMD_ALLOW_ANONYMOUS_EDITS: "true"
       CMD_DEFAULT_PERMISSION: "freely"
-      CMD_ALLOW_FREEURL=true
+      CMD_ALLOW_FREEURL: "true"
       CMD_LDAP_URL: "ldap://{{ ldap_ip_ext }}:389"
       CMD_LDAP_BINDDN: "{{ ldap_readonly_bind_dn }}"
       CMD_LDAP_BINDCREDENTIALS: "{{ ldap_readonly_pass }}"