diff --git a/bitnami/express/docker-compose-mariadb.yml b/bitnami/express/docker-compose-mariadb.yml
index e8748e7b9f0b..3c39386a9969 100644
--- a/bitnami/express/docker-compose-mariadb.yml
+++ b/bitnami/express/docker-compose-mariadb.yml
@@ -10,6 +10,7 @@ services:
     tty: true # Enables debugging capabilities when attached to this container.
     image: bitnami/express:latest
     environment:
+      - PORT=3000
       - DATABASE_URL=mysql://root@mariadb/my_app_development
     depends_on:
       - mariadb
diff --git a/bitnami/express/docker-compose.yml b/bitnami/express/docker-compose.yml
index ad1e8a2c69dd..a742d1ae5d7e 100644
--- a/bitnami/express/docker-compose.yml
+++ b/bitnami/express/docker-compose.yml
@@ -8,6 +8,7 @@ services:
     tty: true # Enables debugging capabilities when attached to this container.
     image: bitnami/express:latest
     environment:
+      - PORT=3000
       - DATABASE_URL=mongodb://mongodb:27017/my_app_development
     depends_on:
       - mongodb