diff --git a/Arduino/CanGrow/include/CanGrow_Sensor.h b/Arduino/CanGrow/include/CanGrow_Sensor.h
index b6da85b..ebfd1da 100644
--- a/Arduino/CanGrow/include/CanGrow_Sensor.h
+++ b/Arduino/CanGrow/include/CanGrow_Sensor.h
@@ -55,7 +55,7 @@ struct Sensor_Index {
   //byte max;
 };
 
-const byte SensorIndex_length = 4;
+const byte SensorIndex_length = 2;
 Sensor_Index SensorIndex[] {
   // 0 is for unset in config
   { "unset", {