diff --git a/tests/test_signatures.py b/tests/test_signatures.py
index cb072f6..7981e93 100644
--- a/tests/test_signatures.py
+++ b/tests/test_signatures.py
@@ -213,7 +213,7 @@ def test_store_signatures_with_different_digests(
     valid_signature, signature_other_digest, mocker, tmp_path
 ):
     """Test that store_signatures raises an error when a signature's digest doesn't match."""
-
+    signatures = [valid_signature, signature_other_digest]
     image_digest = "sha256:123456"
 
     # Mock the signatures path