diff --git a/wally/run_test.py b/wally/run_test.py
index edf58fa..2cd397e 100755
--- a/wally/run_test.py
+++ b/wally/run_test.py
@@ -417,7 +417,7 @@
     new_nodes = []
     old_nodes = ctx.nodes[:]
     try:
-        for new_node, node_id in start_vms.launch_vms(params, already_has_count):
+        for new_node, node_id in start_vms.launch_vms(nova, params, already_has_count):
             new_node.roles.append('testnode')
             ctx.nodes.append(new_node)
             os_nodes_ids.append(node_id)