diff --git a/templates/mariadb/docker-compose_mariadb.yml.erb b/templates/mariadb/docker-compose_mariadb.yml.erb
index 1650563..6130e84 100644
--- a/templates/mariadb/docker-compose_mariadb.yml.erb
+++ b/templates/mariadb/docker-compose_mariadb.yml.erb
@@ -21,6 +21,6 @@ services:
       - MYSQL_ROOT_PASSWORD=<%= @mysql_root_password %>
       - BOOTSTRAP=<%= @bootstrap %>
       - FORCE_BOOTSTRAP=0
-    command:  "--wsrep_cluster_address=gcomm://<%= @db_ip[0] %>,<%= @db_ip[1] %>,<%= @db_ip[2] %>"
+    command:  "--wsrep_cluster_address=gcomm://<%= @db_ip.join(',') %>"
     tty: true