diff --git a/tests/functional/test_fixtures.py b/tests/functional/test_fixtures.py
index 7ae0ef6379..e2669b29b9 100644
--- a/tests/functional/test_fixtures.py
+++ b/tests/functional/test_fixtures.py
@@ -83,7 +83,7 @@ def test_isolation_restore_not_implemented(mocker, networks, fixtures):
         networks.active_provider = orig_provider
 
 
-@pytest.mark.parametrize("snapshot_id", (0, 1, "123", tuple(b"123", 1)))
+@pytest.mark.parametrize("snapshot_id", (0, 1, "123", (b"123", 1)))
 def test_isolation_snapshot_id_types(snapshot_id, fixtures):
     class IsolationManagerWithCustomSnapshot(IsolationManager):
         take_call_count = 0