diff --git a/whitebox_neutron_tempest_plugin/common/utils.py b/whitebox_neutron_tempest_plugin/common/utils.py
index 8dc4d4f..4fa2ec1 100644
--- a/whitebox_neutron_tempest_plugin/common/utils.py
+++ b/whitebox_neutron_tempest_plugin/common/utils.py
@@ -304,9 +304,13 @@ def get_neutron_api_service_name():
 
 
 def get_ml2_conf_file():
-    """Neutron ML2 config file name depending on the installation type"""
+    """Neutron ML2 config file name depending on the installation type
+
+    The default value of WB_CONF.ml2_plugin_config is
+    '/etc/neutron/plugins/ml2/ml2_conf.ini'.
+    """
     if WB_CONF.openstack_type in ('podified', 'devstack'):
-        return '/etc/neutron/plugins/ml2/ml2_conf.ini'
+        return WB_CONF.ml2_plugin_config
     else:
-        return ('/var/lib/config-data/puppet-generated/neutron'
-                '/etc/neutron/plugins/ml2/ml2_conf.ini')
+        return ('/var/lib/config-data/puppet-generated/neutron' +
+                WB_CONF.ml2_plugin_config)