diff --git a/Firmware/LoRaSerial/Serial.ino b/Firmware/LoRaSerial/Serial.ino
index 7b1f7e55..ef5392e5 100644
--- a/Firmware/LoRaSerial/Serial.ino
+++ b/Firmware/LoRaSerial/Serial.ino
@@ -302,7 +302,7 @@ void updateSerial()
 
   //Assert RTS when there is enough space in the receive buffer
   if ((!rtsAsserted) && (availableRXBytes() < (sizeof(serialReceiveBuffer) / 2))
-      && (availableTXBytes() <= RTS_ON_BYTES))
+      && (availableTXBytes() <= settings.rtsOnBytes))
     updateRTS(true); //We're ready for more data
 
   //Attempt to empty the serialTransmitBuffer