diff --git a/docker-compose.yml b/docker-compose.yml
index 61c26a9..a5bcf9a 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -19,7 +19,7 @@ services:
       KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: 1
       ALLOW_PLAINTEXT_LISTENER: yes
     ports:
-      - "${KAFKA_PORT}:9092"
+      - "${KAFKA_PORT:-9092}:9092"
     volumes:
       - phantom_kafka_data:/var/lib/kafka/data