diff --git a/flatland/cli.py b/flatland/cli.py
index 7f3b95fd1666ed6eafd6bb623d3546083b7f898d..9bb7107476a0981fda13b05502949549ce8d4d31 100644
--- a/flatland/cli.py
+++ b/flatland/cli.py
@@ -63,7 +63,7 @@ def demo(args=None):
               )
 @click.option('--results_path',
               type=click.Path(exists=False),
-              default=False,
+              default=None,
               help="Path where the evaluator should write the results metadata.",
               required=False
               )