diff --git a/sensorhandler.cpp b/sensorhandler.cpp
index 4b6eb6e..ed02c62 100644
--- a/sensorhandler.cpp
+++ b/sensorhandler.cpp
@@ -350,6 +350,10 @@
     log<level::DEBUG>("IPMI SET_SENSOR",
                       entry("SENSOR_NUM=0x%02x", sensorNumber));
 
+    if (sensorNumber == 0xFF)
+    {
+        return ipmi::responseInvalidFieldRequest();
+    }
     ipmi::sensor::SetSensorReadingReq cmdData;
 
     cmdData.number = sensorNumber;