diff --git a/tests/components/bluetooth/test_passive_update_processor.py b/tests/components/bluetooth/test_passive_update_processor.py
index d7a7a8ba08c..e9274965e3c 100644
--- a/tests/components/bluetooth/test_passive_update_processor.py
+++ b/tests/components/bluetooth/test_passive_update_processor.py
@@ -1808,6 +1808,7 @@ async def test_naming(hass: HomeAssistant) -> None:
 
     sensor_entity: PassiveBluetoothProcessorEntity = sensor_entities[0]
     sensor_entity.hass = hass
+    sensor_entity.platform = MockEntityPlatform(hass)
     assert sensor_entity.available is True
     assert sensor_entity.name is UNDEFINED
     assert sensor_entity.device_class is SensorDeviceClass.TEMPERATURE