diff --git a/ground/openpilotgcs/src/plugins/config/calibration/sixpointcalibrationmodel.cpp b/ground/openpilotgcs/src/plugins/config/calibration/sixpointcalibrationmodel.cpp
index e5da80250..00f9e7c98 100644
--- a/ground/openpilotgcs/src/plugins/config/calibration/sixpointcalibrationmodel.cpp
+++ b/ground/openpilotgcs/src/plugins/config/calibration/sixpointcalibrationmodel.cpp
@@ -481,7 +481,7 @@ void SixPointCalibrationModel::save()
     if (calibratingMag) {
         RevoCalibration::DataFields revoCalibrationData = revoCalibration->getData();
 
-        for (int i = 0; i < RevoCalibration::MAG_TRANSFORM_R2C2; i++) {
+        for (int i = 0; i < RevoCalibration::MAG_TRANSFORM_R2C2 + 1; i++) {
             revoCalibrationData.mag_transform[i] = result.revoCalibrationData.mag_transform[i];
         }
         for (int i = 0; i < 3; i++) {