diff --git a/podman-hedgedoc/docker-compose.yml b/podman-hedgedoc/docker-compose.yml
index c0f36f9..0415b7b 100644
--- a/podman-hedgedoc/docker-compose.yml
+++ b/podman-hedgedoc/docker-compose.yml
@@ -108,5 +108,5 @@ networks:
 # Define named volumes so data stays in place
 volumes:
   # Volume for PostgreSQL/MySQL database
-  ${dbvolume}
-  ${datavolume}
+  ${dbvolume}:
+  ${datavolume}: