diff --git a/tests/components/incomfort/conftest.py b/tests/components/incomfort/conftest.py
index aacfa886f52..f557e086fcf 100644
--- a/tests/components/incomfort/conftest.py
+++ b/tests/components/incomfort/conftest.py
@@ -157,7 +157,6 @@ def mock_incomfort(
         heater_temp: float
         tap_temp: float
         pressure: float
-        serial_no: str
         nodenr: int
         rf_message_rssi: int
         rfstatus_cntr: int