diff --git a/docker/docker.env b/docker/docker.env
index 89c65f34088a..7ee226109b85 100644
--- a/docker/docker.env
+++ b/docker/docker.env
@@ -14,6 +14,7 @@
 # --------------------------------------------
 DB_CONNECTION=mysql
 DB_HOST=${MYSQL_PORT_3306_TCP_ADDR}
+DB_PORT=${MYSQL_PORT_3306_TCP_PORT}
 DB_DATABASE=${MYSQL_DATABASE}
 DB_USERNAME=${MYSQL_USER}
 DB_PASSWORD=${MYSQL_PASSWORD}