diff --git a/.env.example b/.env.example
index 30c166f..7d63ce3 100644
--- a/.env.example
+++ b/.env.example
@@ -1,4 +1,5 @@
 DB_TYPE = (mysql|sqlite|...)
+DB_PORT = number
 DB_HOST = database_host
 DB_NAME = database_name
 DB_USERNAME = database_username
diff --git a/README.md b/README.md
index e146e48..165f352 100644
--- a/README.md
+++ b/README.md
@@ -23,8 +23,9 @@ services:
     container_name: ff_member_administration_server
     restart: unless-stopped
     environment:
-      - DB_TYPE = mysql
+      - DB_TYPE=mysql
       - DB_HOST=ffm-db
+      - DB_PORT=number # fallback ist auf 3306 gesetzt
       - DB_NAME=administration
       - DB_USERNAME=administration_backend
       - DB_PASSWORD=<dbuserpasswd>
diff --git a/src/data-source.ts b/src/data-source.ts
index 7af52a0..6810a53 100644
--- a/src/data-source.ts
+++ b/src/data-source.ts
@@ -1,7 +1,7 @@
 import "dotenv/config";
 import "reflect-metadata";
 import { DataSource } from "typeorm";
-import { DB_HOST, DB_USERNAME, DB_PASSWORD, DB_NAME, DB_TYPE } from "./env.defaults";
+import { DB_HOST, DB_USERNAME, DB_PASSWORD, DB_NAME, DB_TYPE, DB_PORT } from "./env.defaults";
 
 import { user } from "./entity/user/user";
 import { refresh } from "./entity/refresh";
@@ -70,7 +70,7 @@ import { ExtendViewValues1736084198860 } from "./migrations/1736084198860-extend
 const dataSource = new DataSource({
   type: DB_TYPE as any,
   host: process.env.NODE_ENV || process.env.DBMODE ? "localhost" : DB_HOST,
-  port: 3306,
+  port: DB_PORT,
   username: DB_USERNAME,
   password: DB_PASSWORD,
   database: DB_NAME,
diff --git a/src/env.defaults.ts b/src/env.defaults.ts
index 21c9430..a662555 100644
--- a/src/env.defaults.ts
+++ b/src/env.defaults.ts
@@ -3,6 +3,7 @@ import ms from "ms";
 
 export const DB_TYPE = process.env.DB_TYPE ?? "mysql";
 export const DB_HOST = process.env.DB_HOST ?? "";
+export const DB_PORT = Number(process.env.DB_PORT ?? 3306);
 export const DB_NAME = process.env.DB_NAME ?? "";
 export const DB_USERNAME = process.env.DB_USERNAME ?? "";
 export const DB_PASSWORD = process.env.DB_PASSWORD ?? "";