diff --git a/service/mariadb.yaml b/service/mariadb.yaml
index 1d76033..4ba7724 100644
--- a/service/mariadb.yaml
+++ b/service/mariadb.yaml
@@ -1,7 +1,7 @@
 service:
   name: mariadb
   ports:
-    - mariadb_port
+    - {{ mariadb_port }}
   containers:
     - name: mariadb
       image: mariadb