diff --git a/docker-compose.yaml b/docker-compose.yaml
index a80c874..a4df9c6 100644
--- a/docker-compose.yaml
+++ b/docker-compose.yaml
@@ -15,6 +15,8 @@ services:
     - database
     environment:
     - DATABASE_URL=postgres://mailman:mailmanpass@database/mailmandb
+    - DATABASE_TYPE=postgres
+    - DATABASE_CLASS=mailman.database.postgres.PostgreSQLDatabase
     - HYPERKITTY_API_KEY=someapikey
     networks:
       mailman: