diff --git a/test/test_cache.py b/test/test_cache.py
index 5e633fc..9df9b9c 100644
--- a/test/test_cache.py
+++ b/test/test_cache.py
@@ -188,3 +188,4 @@ def test_permission_error(monkeypatch):
     with pytest.warns(Warning):
         parse(path=__file__, cache=True, diff_cache=True)
     assert was_called
+    parser_cache.clear()