diff --git a/neutron_tempest_plugin/api/base.py b/neutron_tempest_plugin/api/base.py
index e17cf5e..4bcc6d2 100644
--- a/neutron_tempest_plugin/api/base.py
+++ b/neutron_tempest_plugin/api/base.py
@@ -595,15 +595,11 @@
             # Generate subnet CIDRs starting from configured values
             ip_version = ip_version or cls._ip_version
             if ip_version == const.IP_VERSION_4:
-                mask_bits = mask_bits or config.safe_get_config_value(
-                    'network', 'project_network_mask_bits')
-                cidr = netaddr.IPNetwork(config.safe_get_config_value(
-                    'network', 'project_network_cidr'))
+                mask_bits = mask_bits or CONF.network.project_network_mask_bits
+                cidr = netaddr.IPNetwork(CONF.network.project_network_cidr)
             elif ip_version == const.IP_VERSION_6:
-                mask_bits = config.safe_get_config_value(
-                    'network', 'project_network_v6_mask_bits')
-                cidr = netaddr.IPNetwork(config.safe_get_config_value(
-                    'network', 'project_network_v6_cidr'))
+                mask_bits = CONF.network.project_network_v6_mask_bits
+                cidr = netaddr.IPNetwork(CONF.network.project_network_v6_cidr)
             else:
                 raise ValueError('Invalid IP version: {!r}'.format(ip_version))
 
diff --git a/neutron_tempest_plugin/api/test_routers.py b/neutron_tempest_plugin/api/test_routers.py
index 7758b1a..1430b81 100644
--- a/neutron_tempest_plugin/api/test_routers.py
+++ b/neutron_tempest_plugin/api/test_routers.py
@@ -38,9 +38,9 @@
     def resource_setup(cls):
         super(RoutersTest, cls).resource_setup()
         cls.tenant_cidr = (
-            config.safe_get_config_value('network', 'project_network_cidr')
+            CONF.network.project_network_cidr
             if cls._ip_version == 4 else
-            config.safe_get_config_value('network', 'project_network_v6_cidr'))
+            CONF.network.project_network_v6_cidr)
 
     @decorators.idempotent_id('c72c1c0c-2193-4aca-eeee-b1442640eeee')
     @tutils.requires_ext(extension="standard-attr-description",