diff --git a/tests/components/vacuum/test_init.py b/tests/components/vacuum/test_init.py
index 8babd9fa265..8ae054b5646 100644
--- a/tests/components/vacuum/test_init.py
+++ b/tests/components/vacuum/test_init.py
@@ -33,6 +33,7 @@ from .common import async_start
 from tests.common import (
     MockConfigEntry,
     MockEntity,
+    MockEntityPlatform,
     MockModule,
     help_test_all,
     import_and_test_deprecated_constant_enum,
@@ -288,6 +289,8 @@ async def test_supported_features_compat(hass: HomeAssistant) -> None:
         _attr_fan_speed_list = ["silent", "normal", "pet hair"]
 
     entity = _LegacyConstantsStateVacuum()
+    entity.hass = hass
+    entity.platform = MockEntityPlatform(hass)
     assert isinstance(entity.supported_features, int)
     assert entity.supported_features == int(features)
     assert entity.supported_features_compat is (