diff --git a/tests/components/homekit/test_accessories.py b/tests/components/homekit/test_accessories.py
index 23706f02e75..edb1c7175f8 100644
--- a/tests/components/homekit/test_accessories.py
+++ b/tests/components/homekit/test_accessories.py
@@ -104,6 +104,7 @@ async def test_battery_service(hass, hk_driver):
     await hass.async_block_till_done()
 
     acc = HomeAccessory(hass, hk_driver, 'Battery Service', entity_id, 2, None)
+    acc.update_state = lambda x: None
     assert acc._char_battery.value == 0
     assert acc._char_low_battery.value == 0
     assert acc._char_charging.value == 2
@@ -126,6 +127,7 @@ async def test_battery_service(hass, hk_driver):
     await hass.async_block_till_done()
 
     acc = HomeAccessory(hass, hk_driver, 'Battery Service', entity_id, 2, None)
+    acc.update_state = lambda x: None
     assert acc._char_battery.value == 0
     assert acc._char_low_battery.value == 0
     assert acc._char_charging.value == 2