diff --git a/tests/components/arcam_fmj/conftest.py b/tests/components/arcam_fmj/conftest.py
index 6c73b5c763a..ca4af1b00a3 100644
--- a/tests/components/arcam_fmj/conftest.py
+++ b/tests/components/arcam_fmj/conftest.py
@@ -99,6 +99,7 @@ async def player_setup_fixture(
             return state_1
         if zone == 2:
             return state_2
+        raise ValueError(f"Unknown player zone: {zone}")
 
     await async_setup_component(hass, "homeassistant", {})