diff --git a/packages/usb/read-adc.js b/packages/usb/read-adc.js
index d32b9118..16859d20 100755
--- a/packages/usb/read-adc.js
+++ b/packages/usb/read-adc.js
@@ -8,7 +8,7 @@ function readAdc() {
     console.log('Sending ', data);
     device.write(data);
     const receivedBuffer = Buffer.from(device.readSync());
-    console.log('Received', uhk.bufferToString(receivedBuffer), (receivedBuffer[1]*255 + receivedBuffer[0])/4096*5.5*1.045);
+    console.log('Received', uhk.bufferToString(receivedBuffer), (receivedBuffer[2]*255 + receivedBuffer[1])/4096*5.5*1.045);
 
     setTimeout(readAdc, 500)
 }