diff --git a/supervisor/addons/validate.py b/supervisor/addons/validate.py
index ca9eb5eec..bb982082c 100644
--- a/supervisor/addons/validate.py
+++ b/supervisor/addons/validate.py
@@ -192,7 +192,9 @@ SCHEMA_ADDON_CONFIG = vol.Schema(
         vol.Required(ATTR_ARCH): [vol.In(ARCH_ALL)],
         vol.Optional(ATTR_MACHINE): vol.All([vol.Match(RE_MACHINE)], vol.Unique()),
         vol.Optional(ATTR_URL): vol.Url(),
-        vol.Required(ATTR_STARTUP): vol.All(_simple_startup, vol.Coerce(AddonStartup)),
+        vol.Optional(ATTR_STARTUP, default=AddonStartup.APPLICATION): vol.All(
+            _simple_startup, vol.Coerce(AddonStartup)
+        ),
         vol.Optional(ATTR_BOOT, default=AddonBoot.AUTO): vol.Coerce(AddonBoot),
         vol.Optional(ATTR_INIT, default=True): vol.Boolean(),
         vol.Optional(ATTR_ADVANCED, default=False): vol.Boolean(),