diff --git a/README.md b/README.md
index 6fd29cc..3aa6cc7 100644
--- a/README.md
+++ b/README.md
@@ -94,6 +94,7 @@ If you want to have three brokers and experiment with kafka replication / fault-
 
 Run with:
 ```
+export DOCKER_HOST_IP="DOCKER HOST IP"
 docker-compose -f zk-single-kafka-multiple.yml up
 docker-compose -f zk-single-kafka-multiple.yml down
 ```
@@ -122,6 +123,7 @@ If you want to have three zookeeper nodes and three kafka brokers to experiment
 
 Run with:
 ```
+export DOCKER_HOST_IP="DOCKER HOST IP"
 docker-compose -f zk-multiple-kafka-multiple.yml up
 docker-compose -f zk-multiple-kafka-multiple.yml down
 ```
diff --git a/zk-multiple-kafka-multiple.yml b/zk-multiple-kafka-multiple.yml
index 3c6532a..faacf0f 100644
--- a/zk-multiple-kafka-multiple.yml
+++ b/zk-multiple-kafka-multiple.yml
@@ -44,7 +44,7 @@ services:
       - "9092:9092"
       - "29092:29092"
     environment:
-      KAFKA_ADVERTISED_LISTENERS: INTERNAL://kafka1:19092,EXTERNAL://${DOCKER_HOST_IP:-127.0.0.1}:9092,DOCKER://host.docker.internal:29092
+      KAFKA_ADVERTISED_LISTENERS: INTERNAL://kafka1:19092,EXTERNAL://${DOCKER_HOST_IP}:9092,DOCKER://host.docker.internal:29092
       KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: INTERNAL:PLAINTEXT,EXTERNAL:PLAINTEXT,DOCKER:PLAINTEXT
       KAFKA_INTER_BROKER_LISTENER_NAME: INTERNAL
       KAFKA_ZOOKEEPER_CONNECT: "zoo1:2181,zoo2:2182,zoo3:2183"
@@ -65,7 +65,7 @@ services:
       - "9093:9093"
       - "29093:29093"
     environment:
-      KAFKA_ADVERTISED_LISTENERS: INTERNAL://kafka2:19093,EXTERNAL://${DOCKER_HOST_IP:-127.0.0.1}:9093,DOCKER://host.docker.internal:29093
+      KAFKA_ADVERTISED_LISTENERS: INTERNAL://kafka2:19093,EXTERNAL://${DOCKER_HOST_IP}:9093,DOCKER://host.docker.internal:29093
       KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: INTERNAL:PLAINTEXT,EXTERNAL:PLAINTEXT,DOCKER:PLAINTEXT
       KAFKA_INTER_BROKER_LISTENER_NAME: INTERNAL
       KAFKA_ZOOKEEPER_CONNECT: "zoo1:2181,zoo2:2182,zoo3:2183"
@@ -86,7 +86,7 @@ services:
       - "9094:9094"
       - "29094:29094"
     environment:
-      KAFKA_ADVERTISED_LISTENERS: INTERNAL://kafka3:19094,EXTERNAL://${DOCKER_HOST_IP:-127.0.0.1}:9094,DOCKER://host.docker.internal:29094
+      KAFKA_ADVERTISED_LISTENERS: INTERNAL://kafka3:19094,EXTERNAL://${DOCKER_HOST_IP}:9094,DOCKER://host.docker.internal:29094
       KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: INTERNAL:PLAINTEXT,EXTERNAL:PLAINTEXT,DOCKER:PLAINTEXT
       KAFKA_INTER_BROKER_LISTENER_NAME: INTERNAL
       KAFKA_ZOOKEEPER_CONNECT: "zoo1:2181,zoo2:2182,zoo3:2183"
@@ -97,4 +97,4 @@ services:
     depends_on:
       - zoo1
       - zoo2
-      - zoo3
+      - zoo3
\ No newline at end of file
diff --git a/zk-single-kafka-multiple.yml b/zk-single-kafka-multiple.yml
index b5e0b73..a292f06 100644
--- a/zk-single-kafka-multiple.yml
+++ b/zk-single-kafka-multiple.yml
@@ -21,7 +21,7 @@ services:
       - "9092:9092"
       - "29092:29092"
     environment:
-      KAFKA_ADVERTISED_LISTENERS: INTERNAL://kafka1:19092,EXTERNAL://${DOCKER_HOST_IP:-127.0.0.1}:9092,DOCKER://host.docker.internal:29092
+      KAFKA_ADVERTISED_LISTENERS: INTERNAL://kafka1:19092,EXTERNAL://${DOCKER_HOST_IP}:9092,DOCKER://host.docker.internal:29092
       KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: INTERNAL:PLAINTEXT,EXTERNAL:PLAINTEXT,DOCKER:PLAINTEXT
       KAFKA_INTER_BROKER_LISTENER_NAME: INTERNAL
       KAFKA_ZOOKEEPER_CONNECT: "zoo1:2181"
@@ -40,7 +40,7 @@ services:
       - "9093:9093"
       - "29093:29093"
     environment:
-      KAFKA_ADVERTISED_LISTENERS: INTERNAL://kafka2:19093,EXTERNAL://${DOCKER_HOST_IP:-127.0.0.1}:9093,DOCKER://host.docker.internal:29093
+      KAFKA_ADVERTISED_LISTENERS: INTERNAL://kafka2:19093,EXTERNAL://${DOCKER_HOST_IP}:9093,DOCKER://host.docker.internal:29093
       KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: INTERNAL:PLAINTEXT,EXTERNAL:PLAINTEXT,DOCKER:PLAINTEXT
       KAFKA_INTER_BROKER_LISTENER_NAME: INTERNAL
       KAFKA_ZOOKEEPER_CONNECT: "zoo1:2181"
@@ -60,7 +60,7 @@ services:
       - "9094:9094"
       - "29094:29094"
     environment:
-      KAFKA_ADVERTISED_LISTENERS: INTERNAL://kafka3:19094,EXTERNAL://${DOCKER_HOST_IP:-127.0.0.1}:9094,DOCKER://host.docker.internal:29094
+      KAFKA_ADVERTISED_LISTENERS: INTERNAL://kafka3:19094,EXTERNAL://${DOCKER_HOST_IP}:9094,DOCKER://host.docker.internal:29094
       KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: INTERNAL:PLAINTEXT,EXTERNAL:PLAINTEXT,DOCKER:PLAINTEXT
       KAFKA_INTER_BROKER_LISTENER_NAME: INTERNAL
       KAFKA_ZOOKEEPER_CONNECT: "zoo1:2181"
@@ -69,4 +69,4 @@ services:
       KAFKA_AUTHORIZER_CLASS_NAME: kafka.security.authorizer.AclAuthorizer
       KAFKA_ALLOW_EVERYONE_IF_NO_ACL_FOUND: "true"
     depends_on:
-      - zoo1
+      - zoo1
\ No newline at end of file