diff --git a/docker-compose.yml b/docker-compose.yml
index 8c20fc9..fd79506 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,6 +1,6 @@
 version: "2"
 volumes:
-- pgdata:
+  pgdata:
 services:
   postgres:
     image: "openmaptiles/postgis:2.2"