diff --git a/tests/responses/powermeter/device_list_faulty.xml b/tests/responses/powermeter/device_list_faulty.xml
index 925f747..1de8268 100644
--- a/tests/responses/powermeter/device_list_faulty.xml
+++ b/tests/responses/powermeter/device_list_faulty.xml
@@ -10,13 +10,10 @@
             <devicelock>0</devicelock>
         </switch>
         <powermeter>
-            <power>0</power>
-            <energy>0</energy>
-            <voltage>0</voltage>
         </powermeter>
         <temperature>
             <celsius>285</celsius>
             <offset>0</offset>
         </temperature>
     </device>
-</devicelist>
\ No newline at end of file
+</devicelist>
diff --git a/tests/test_fritzhomedevicepowermeter.py b/tests/test_fritzhomedevicepowermeter.py
index 1d568b7..026b601 100644
--- a/tests/test_fritzhomedevicepowermeter.py
+++ b/tests/test_fritzhomedevicepowermeter.py
@@ -74,7 +74,7 @@ def test_faulty_powermeter_properties(self):
         self.fritz.update_devices()
         device = self.fritz.get_device_by_ain("08761 0000434")
 
-        assert device.energy == 0
-        assert device.power == 0
-        assert device.voltage == 0
+        assert device.energy is None
+        assert device.power is None
+        assert device.voltage is None
         assert device.current is None