diff --git a/tests/system/cli/test_sync.py b/tests/system/cli/test_sync.py
index b5b3847..e8ddca9 100644
--- a/tests/system/cli/test_sync.py
+++ b/tests/system/cli/test_sync.py
@@ -1,6 +1,7 @@
 # -*- coding: utf-8 -*-
 
 import json
+import sys
 from textwrap import dedent
 
 import hypothesis.strategies as st