diff --git a/tests/components/unifi/conftest.py b/tests/components/unifi/conftest.py
index d48ff613902..0cddd505cd4 100644
--- a/tests/components/unifi/conftest.py
+++ b/tests/components/unifi/conftest.py
@@ -121,6 +121,7 @@ def mock_device_registry(hass):
             "00:00:00:00:00:03",
             "00:00:00:00:00:04",
             "00:00:00:00:00:05",
+            "00:00:00:00:00:06",
             "00:00:00:00:01:01",
             "00:00:00:00:02:02",
         )