diff --git a/tcp_tests/templates/cookied-model-generator/underlay.yaml b/tcp_tests/templates/cookied-model-generator/underlay.yaml
index 6a3ceff..e90a8c8 100644
--- a/tcp_tests/templates/cookied-model-generator/underlay.yaml
+++ b/tcp_tests/templates/cookied-model-generator/underlay.yaml
@@ -3,7 +3,7 @@
 
 {% set LAB_CONFIG_NAME = os_env('LAB_CONFIG_NAME', 'cookied-model-generator') %}
 {% set DOMAIN_NAME = os_env('DOMAIN_NAME', LAB_CONFIG_NAME + '.local') %}
-{% set HOSTNAME_CFG01 = os_env('HOSTNAME_CFG01', 'cfg01.' + DOMAIN_NAME) %}
+{% set HOSTNAME_CFG01 = os_env('HOSTNAME_CFG01', 'cfg01') %}
 
 {% import 'cookied-model-generator/underlay--meta-data.yaml' as CLOUDINIT_META_DATA with context %}
 {% import 'cookied-model-generator/underlay--user-data-cfg01.yaml' as CLOUDINIT_USER_DATA_CFG01 with context %}