diff --git a/docker-compose.example.yml b/docker-compose.example.yml
index ee2f875e..42b02dba 100644
--- a/docker-compose.example.yml
+++ b/docker-compose.example.yml
@@ -61,8 +61,7 @@ services:
       - "/srv/pterodactyl/certs/:/etc/letsencrypt/"
       - "/srv/pterodactyl/logs/:/app/storage/logs"
     environment:
-      <<: *panel-environment
-      <<: *mail-environment
+      <<: [*panel-environment, *mail-environment]
       DB_PASSWORD: *db-password
       APP_ENV: "production"
       APP_ENVIRONMENT_ONLY: "false"