diff --git a/docker-compose-test/docker-compose-parser.yaml b/docker-compose-test/docker-compose-parser.yaml
index d43b386..8bcb0bf 100644
--- a/docker-compose-test/docker-compose-parser.yaml
+++ b/docker-compose-test/docker-compose-parser.yaml
@@ -3,6 +3,7 @@ services:
   app:
     image: nginx
     environment:
+      DB_URL: 'postgres://$POSTGRES_USER'
       SERVICE_FQDN_APP: /app
       APP_KEY: base64
       APP_DEBUG: '${APP_DEBUG:-false}'