diff --git a/backend/services/database.js b/backend/services/database.js
index 8b6beb2..dec6e0a 100644
--- a/backend/services/database.js
+++ b/backend/services/database.js
@@ -8,6 +8,7 @@ const pool = mysql
     user: process.env.DB_USER,
     password: process.env.DB_PASSWORD,
     database: process.env.DB_NAME,
+    port: process.env.DB_PORT,
   })
   .promise();
 
diff --git a/docker-compose.yml b/docker-compose.yml
index 20b7573..3d374c9 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -23,7 +23,8 @@ services:
       - proxynet
       - borrow_system-internal
     environment:
-      DB_HOST: 127.0.0.1
+      DB_HOST: mysql
+      DB_PORT: 3306
       DB_USER: root
       DB_PASSWORD: ${DB_PASSWORD}
       DB_NAME: borrow_system