diff --git a/tests/components/xiaomi/test_device_tracker.py b/tests/components/xiaomi/test_device_tracker.py
index 975e666af68..0f1c36d1fba 100644
--- a/tests/components/xiaomi/test_device_tracker.py
+++ b/tests/components/xiaomi/test_device_tracker.py
@@ -144,6 +144,7 @@ def mocked_requests(*args, **kwargs):
             200,
         )
     _LOGGER.debug("UNKNOWN ROUTE")
+    return None
 
 
 @patch(