diff --git a/bdd.yml b/bdd.yml
index 485d0b4..7a0bf6c 100644
--- a/bdd.yml
+++ b/bdd.yml
@@ -2,4 +2,6 @@
 ---
 # Install and configure bdd servers at Saclay and at OVH
 - hosts: bdd
-  roles: postgresql_server
+  roles:
+    - postgresql_server
+...