diff --git a/db/docker-compose.yml b/db/docker-compose.yml
index 12241c7..309edbf 100644
--- a/db/docker-compose.yml
+++ b/db/docker-compose.yml
@@ -70,8 +70,8 @@ services:
     volumes:
       - rabbitmq_data:/var/lib/rabbitmq
     environment:
-      - RABBITMQ_DEFAULT_USER=$MQTT_USERNAME
-      - RABBITMQ_DEFAULT_PASS=$MQTT_PASSWORD
+      - RABBITMQ_DEFAULT_USER=${MQTT_USERNAME:?MQTT_USERNAME is required}
+      - RABBITMQ_DEFAULT_PASS=${MQTT_PASSWORD:?MQTT_PASSWORD is required}
     command: sh -c "rabbitmq-plugins enable rabbitmq_mqtt && rabbitmq-server"
 
 volumes: