diff --git a/docker-compose-test/docker-compose-parser.yaml b/docker-compose-test/docker-compose-parser.yaml
index 1c844ea..a232198 100644
--- a/docker-compose-test/docker-compose-parser.yaml
+++ b/docker-compose-test/docker-compose-parser.yaml
@@ -16,8 +16,8 @@ services:
   db:
     image: postgres
     environment:
-      POSTGRES_USER: postgres
-      POSTGRES_PASSWORD: postgres
+      POSTGRES_USER: ${POSTGRES_USER:-postgres}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-postgres}
     volumes:
       - 'data:/var/lib/postgresql/data'
     healthcheck: