diff --git a/tools/idf_py_actions/serial_ext.py b/tools/idf_py_actions/serial_ext.py
index 9b8dfb8c74..4638dc2b28 100644
--- a/tools/idf_py_actions/serial_ext.py
+++ b/tools/idf_py_actions/serial_ext.py
@@ -162,6 +162,7 @@ def action_extensions(base_actions, project_path):
         'help': 'Serial port.',
         'scope': 'global',
         'envvar': 'ESPPORT',
+        'type': click.Path(),
         'default': None,
     }