diff --git a/afsk/main.c b/afsk/main.c
index 2f48ceec..031fc4bd 100644
--- a/afsk/main.c
+++ b/afsk/main.c
@@ -132,7 +132,7 @@ struct SensorData read_sensor_data(struct SensorConfig sensor) {
     printf("********* value0 %d value1 %f value %d data.current %f \n", value0, value1, value, data.current);
 */    
     valuec1 = wireReadRegister(sensor.fd, INA219_REG_SHUNTVOLTAGE);
-    twos = twosToInt(valuec1, 16);
+    twos = twosToInt(valuec1, 12);
     valuec3 = ((float)twos) * sensor.calValue;
     printf("@@@@@@@ Register: %d Shunt: %d Calc Current: %f \n", valuec1, twos, valuec3);