diff --git a/docker-compose.slave.yml b/docker-compose.slave.yml
index 15e17b8..56b3541 100644
--- a/docker-compose.slave.yml
+++ b/docker-compose.slave.yml
@@ -17,7 +17,7 @@ services:
 
   pdns:
     image: pschiffe/pdns-mysql:latest
-    container_name: pdns-master
+    container_name: pdns-slave
     environment:
       PDNS_gmysql_host: mariadb
       PDNS_gmysql_port: 3306
@@ -25,7 +25,8 @@ services:
       PDNS_gmysql_password: ${MARIADB_PASSWORD}
       PDNS_gmysql_dbname: ${MARIADB_DATABASE}
       PDNS_gmysql-dnssec: true
-      PDNS_primary: yes
+      PDNS_slave: yes
+      PDNS_master: ${MASTER_PDNS_IP}
       PDNS_api: yes
       PDNS_api_key: ${PDNS_API_KEY}
       PDNS_webserver: yes
diff --git a/inc.env b/inc.env
index c33b249..3025dd8 100644
--- a/inc.env
+++ b/inc.env
@@ -11,4 +11,6 @@ MARIADB_PASSWORD=
 
 PDNS_API_KEY=
 PDNS_WEBSERVER_KEY=
-PDNS_VERSION_STRING=
\ No newline at end of file
+PDNS_VERSION_STRING=
+MASTER_PDNS_IP=
+MASTER_PDNS_API_KEY=
\ No newline at end of file