diff --git a/homeassistant/components/zwave_js/config_flow.py b/homeassistant/components/zwave_js/config_flow.py
index 2edb7012878..75d7692c858 100644
--- a/homeassistant/components/zwave_js/config_flow.py
+++ b/homeassistant/components/zwave_js/config_flow.py
@@ -16,7 +16,9 @@ from .const import DOMAIN, NAME  # pylint:disable=unused-import
 
 _LOGGER = logging.getLogger(__name__)
 
-STEP_USER_DATA_SCHEMA = vol.Schema({CONF_URL: str})
+DEFAULT_URL = "ws://localhost:3000"
+
+STEP_USER_DATA_SCHEMA = vol.Schema({vol.Required(CONF_URL, default=DEFAULT_URL): str})
 
 
 async def validate_input(hass: core.HomeAssistant, user_input: dict) -> VersionInfo: