diff --git a/.env.example b/.env.example
index 54a6a12..0ae92a0 100644
--- a/.env.example
+++ b/.env.example
@@ -6,3 +6,4 @@ DB_USERNAME=
 DB_PASSWORD=
 DB_DATABASE=
 DB_ROOTPW=
+DB_PORT=
diff --git a/docker-compose.yml b/docker-compose.yml
index 7677bc2..95fdf0d 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -16,7 +16,7 @@ services:
   mysql:
       image: mysql:8.0
       ports:
-        - 3306:3306
+        - ${DB_PORT}:3306
       volumes:
         - ./data/db:/var/lib/mysql
       environment: