diff --git a/tests/components/homeassistant/test_init.py b/tests/components/homeassistant/test_init.py
index 56eeb4177b1..0aed3dc929e 100644
--- a/tests/components/homeassistant/test_init.py
+++ b/tests/components/homeassistant/test_init.py
@@ -38,6 +38,7 @@ from homeassistant.setup import async_setup_component
 
 from tests.common import (
     MockConfigEntry,
+    MockEntityPlatform,
     MockUser,
     async_capture_events,
     async_mock_service,
@@ -90,6 +91,8 @@ async def test_reload_core_conf(hass: HomeAssistant) -> None:
     ent = entity.Entity()
     ent.entity_id = "test.entity"
     ent.hass = hass
+    platform = MockEntityPlatform(hass, domain="test", platform_name="test")
+    await platform.async_add_entities([ent])
     ent.async_write_ha_state()
 
     state = hass.states.get("test.entity")