diff --git a/src/main.cpp b/src/main.cpp
index b8800d0..f2cd3a8 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -63,7 +63,7 @@ static constexpr uint8_t SDS_RX = D2;
 
 static constexpr uint8_t GEIGER_PIN = D6;
 static constexpr float CONV_FACTOR = 0.008120;
-static constexpr float OWN_BACKGROUND_CPS = 0.2;
+static constexpr float OWN_BACKGROUND_CPS = 0;  // documentation says 0.2 (make sure value doesn't get negative if subtracting!)
 static constexpr unsigned long logging_period_ms = 60000;
 
 ADC_MODE(ADC_VCC);