diff --git a/test/crossrunner/run.py b/test/crossrunner/run.py
index 3f9aaa4..f522bb1 100644
--- a/test/crossrunner/run.py
+++ b/test/crossrunner/run.py
@@ -37,6 +37,10 @@
 RESULT_TIMEOUT = 128
 RESULT_ERROR = 64
 
+# globals
+ports = None
+stop = None
+
 
 class ExecutionContext(object):
     def __init__(self, cmd, cwd, env, report):