diff --git a/homeassistant/components/systemmonitor/sensor.py b/homeassistant/components/systemmonitor/sensor.py
index 5c6294107f839..53a5a80621457 100644
--- a/homeassistant/components/systemmonitor/sensor.py
+++ b/homeassistant/components/systemmonitor/sensor.py
@@ -305,6 +305,7 @@ def check_required_arg(value: Any) -> Any:
     "soc_thermal 1",
     "Tctl",
     "cpu0-thermal",
+    "cpu0_thermal",
 ]