diff --git a/roles/mastodon/templates/mastodon.conf.j2 b/roles/mastodon/templates/mastodon.conf.j2
index 5bb2931..f813d81 100644
--- a/roles/mastodon/templates/mastodon.conf.j2
+++ b/roles/mastodon/templates/mastodon.conf.j2
@@ -6,7 +6,7 @@ map $http_upgrade $connection_upgrade {
 server {
   listen 80;
   listen [::]:80;
-  server_name {{ mastodon_host }};
+  server_name {{ mastodon_host | default('{{ ansible_fqdn }}') }};
 
   # Useful for Let's Encrypt
   location /.well-known/acme-challenge/ { allow all; }
@@ -24,8 +24,8 @@ server {
   ssl_session_cache shared:SSL:10m;
 
 {% if disable_letsencrypt != "true" %}
-  ssl_certificate     /etc/letsencrypt/live/{{ mastodon_host }}/fullchain.pem;
-  ssl_certificate_key /etc/letsencrypt/live/{{ mastodon_host }}/privkey.pem;
+  ssl_certificate     /etc/letsencrypt/live/{{ mastodon_host | default('{{ ansible_fqdn }}') }}/fullchain.pem;
+  ssl_certificate_key /etc/letsencrypt/live/{{ mastodon_host | default('{{ ansible_fqdn }}') }}/privkey.pem;
 {% endif %}
 
   keepalive_timeout    70;