diff --git a/tests/test_vm2vm.py b/tests/test_vm2vm.py
index 8a94600..51dccdd 100644
--- a/tests/test_vm2vm.py
+++ b/tests/test_vm2vm.py
@@ -107,7 +107,8 @@
         for i in range(4):
             if transport1.check_vm_is_reachable_ssh(
                     floating_ip=vm_info[i]['fip'], timeout=ssh_timeout):
-                ssh.prepare_iperf(vm_info[i]['fip'], private_key=private_key)
+                ssh.IperfAtVM(
+                    vm_info[i]['fip'], private_key=private_key)
                 mtus.append(transport1.get_mtu_from_vm(
                     vm_info[i]['fip'], private_key=private_key))
         logger.info("MTU at networks: {}, {}".format(