diff --git a/tests/test_physics_factory.py b/tests/test_physics_factory.py
index 0990afc1..4ae7d925 100644
--- a/tests/test_physics_factory.py
+++ b/tests/test_physics_factory.py
@@ -43,6 +43,7 @@ class TestPhysicsFactory(TestCase):
     """
     city = self._get_city_with_physics()
     for building in city.buildings:
+      self.assertIsNotNone(building.average_storey_height, 'average_storey_height is none')
       self.assertIsNotNone(building.storeys_above_ground, 'storeys_above_ground is none')
       for thermal_zone in building.thermal_zones:
         self.assertIsNotNone(thermal_zone.effective_thermal_capacity, 'effective_thermal_capacity is none')