diff --git a/afsk/main.c b/afsk/main.c
index c9ca77a8..f6e05662 100644
--- a/afsk/main.c
+++ b/afsk/main.c
@@ -112,7 +112,7 @@ struct SensorData read_sensor_data(struct SensorConfig sensor) {
     wiringPiI2CWriteReg16(sensor.fd, INA219_REG_CALIBRATION, sensor.calValue);
 //    data.current  = (float)((int16_t)wiringPiI2CReadReg16(sensor.fd, INA219_REG_CURRENT)) / (float)sensor.currentDivider;
     int16_t value0  = 1; // (int16_t)wiringPiI2CReadReg16(sensor.fd, INA219_REG_CURRENT);
-    wiringPiI2CWrite(fd, INA219_REG_CURRENT);
+    wiringPiI2CWrite(sensor.fd, INA219_REG_CURRENT);
     delay(1); // Max 12-bit conversion time is 586us per sample	
     int16_t value = (int16_t)((wiringPiI2CRead(sensor.fd) << 8 ) | wiringPiI2CRead (sensor.fd));
     float value1 = (float) value;