diff --git a/tests/e2e/conftest.py b/tests/e2e/conftest.py
index de447ec1..a949d908 100644
--- a/tests/e2e/conftest.py
+++ b/tests/e2e/conftest.py
@@ -27,7 +27,7 @@ def working_directory() -> str:
     """
     with tempfile.TemporaryDirectory() as temp_dir:
 
-        def _assert_working_directory_empty(self, is_error: bool):
+        def _assert_working_directory_empty(self, is_error: bool = False):
             files = [str(file_path) for file_path in _get_files_in_directory(temp_dir)]
             num_files = len(files)
             shutil.rmtree(temp_dir)