diff --git a/toad/utils/pickletracer_test.py b/toad/utils/pickletracer_test.py
index 9534046..b2a42a6 100644
--- a/toad/utils/pickletracer_test.py
+++ b/toad/utils/pickletracer_test.py
@@ -1,3 +1,4 @@
+import sys
 import pytest
 from .pickletracer import Tracer, get_current_tracer