diff --git a/ESP32_bme680_CC_demo_02.ino b/ESP32_bme680_CC_demo_02.ino
index 7d6d8ab..53a4661 100644
--- a/ESP32_bme680_CC_demo_02.ino
+++ b/ESP32_bme680_CC_demo_02.ino
@@ -135,7 +135,7 @@ void GetGasReference(){
   // Now run the sensor for a burn-in period, then use combination of relative humidity and gas resistance to estimate indoor air quality as a percentage.
   Serial.println("Getting a new gas reference value");
   int readings = 10;
-  for (int i = 0; i <= readings; i++){ // read gas for 10 x 0.150mS = 1.5secs
+  for (int i = 1; i <= readings; i++){ // read gas for 10 x 0.150mS = 1.5secs
     gas_reference += bme.readGas();
   }
   gas_reference = gas_reference / readings;