diff --git a/test/test_superfaktura_api.py b/test/test_superfaktura_api.py
index 919140a..c4e295e 100644
--- a/test/test_superfaktura_api.py
+++ b/test/test_superfaktura_api.py
@@ -84,6 +84,5 @@ def test_download_not_writable_descriptor(api):
         mock_get.return_value.content = b"test_content"
         mock_descriptor = MagicMock()
         mock_descriptor.writable.return_value = False
-        with patch("builtins.open", mock_open()) as mock_file:
-            with pytest.raises(SuperFakturaAPIException, match=" is not writable"):
-                api.download("test_endpoint", mock_descriptor)
+        with pytest.raises(SuperFakturaAPIException, match=" is not writable"):
+            api.download("test_endpoint", mock_descriptor)