diff --git a/tools/testing/tests/tester.py b/tools/testing/tests/tester.py
index 21759ee..4091ce2 100644
--- a/tools/testing/tests/tester.py
+++ b/tools/testing/tests/tester.py
@@ -1,4 +1,4 @@
-import time, struct, sys
+import time, struct
 
 from fido2.hid import CtapHidDevice
 from fido2.client import Fido2Client