diff --git a/ansible/roles/mastodon/files/docker-compose.yml b/ansible/roles/mastodon/files/docker-compose.yml
index 5530227..d0ddaff 100644
--- a/ansible/roles/mastodon/files/docker-compose.yml
+++ b/ansible/roles/mastodon/files/docker-compose.yml
@@ -7,7 +7,7 @@ services:
       - PGID={{ docker_user.id }}
       - LOCAL_DOMAIN=theorangeone.net
       - WEB_DOMAIN=mastodon.theorangeone.net
-      - DATABASE_URL=postgresql://mastodon:mastodon@db/mastodon
+      - DATABASE_URL=postgresql://mastodon:mastodon@db:5432/mastodon
       - REDIS_URL=redis://redis
       - SIDEKIQ_REDIS_URL=redis://redis/1
       - SECRET_KEY_BASE={{ vault_secret_key_base }}