diff --git a/fuelweb_test/tests/test_net_templates_base.py b/fuelweb_test/tests/test_net_templates_base.py
index 09be5ff7e..c32ee847f 100644
--- a/fuelweb_test/tests/test_net_templates_base.py
+++ b/fuelweb_test/tests/test_net_templates_base.py
@@ -56,7 +56,7 @@ class TestNetworkTemplatesBase(TestBasic):
             group_id = [n['id'] for n in nodegroups if
                         n['name'] == nodegroup][0]
             ip_network = netaddr.IPNetwork(str(ip_nets[nodegroup]))
-            ip_subnets = ip_network.subnet(int(ip_prefixlen))
+            ip_subnets = list(ip_network.subnet(int(ip_prefixlen)))
             for network, interface in networks:
                 ip_subnet = ip_subnets.pop()
                 networks_data.append(