diff --git a/libsensors/LightSensor.cpp b/libsensors/LightSensor.cpp
index 6b212e8..5d24b3f 100644
--- a/libsensors/LightSensor.cpp
+++ b/libsensors/LightSensor.cpp
@@ -157,6 +157,6 @@ float LightSensor::indexToValue(size_t index) const
 
     const size_t maxIndex = sizeof(luxValues)/sizeof(*luxValues) - 1;
     if (index > maxIndex)
-        index = maxIndex;
+        index = 0;
     return luxValues[index];
 }