diff --git a/web.yml b/web.yml
index 382e827..a70100a 100644
--- a/web.yml
+++ b/web.yml
@@ -6,7 +6,7 @@
   become: yes
   roles:
     - common
-    - mariadb
+    - { role: mariadb, when: mariadb_databases is defined}
     - nginx
     - php-fpm
     - munin