diff --git a/overrides/compose.mariadb.yaml b/overrides/compose.mariadb.yaml
index 22d95ea5..e79288c0 100644
--- a/overrides/compose.mariadb.yaml
+++ b/overrides/compose.mariadb.yaml
@@ -2,7 +2,7 @@ services:
   configurator:
     environment:
       DB_HOST: db
-      DB_PORT: 3306
+      DB_PORT: "3306"
     depends_on:
       db:
         condition: service_healthy