diff --git a/tests/test_signatures.py b/tests/test_signatures.py
index 99e0907..075d579 100644
--- a/tests/test_signatures.py
+++ b/tests/test_signatures.py
@@ -8,6 +8,7 @@ from pytest_subprocess import FakeProcess
 from dangerzone import errors as dzerrors
 from dangerzone.updater import errors
 from dangerzone.updater.signatures import (
+    Signature,
     get_config_dir,
     get_last_log_index,
     get_log_index_from_signatures,