diff --git a/source/RobotAPI/gui-plugins/FTSensorCalibrationGui/FTSensorCalibrationGuiWidgetController.h b/source/RobotAPI/gui-plugins/FTSensorCalibrationGui/FTSensorCalibrationGuiWidgetController.h
index 4b813cd58e53b9f7772a4598bad06b3c2bab5643..8c69592b4d3b18b4dca7877fe4a8de4264ba855e 100644
--- a/source/RobotAPI/gui-plugins/FTSensorCalibrationGui/FTSensorCalibrationGuiWidgetController.h
+++ b/source/RobotAPI/gui-plugins/FTSensorCalibrationGui/FTSensorCalibrationGuiWidgetController.h
@@ -175,7 +175,7 @@ namespace armarx
 
         Eigen::Matrix6f                   _conversion_matrix;
         Eigen::Vector6f                   _offset;
-        Eigen::Vector6f                   _channel_order;
+        Eigen::Vector6i                   _channel_order;
         float                             _ticks_to_volt_factor;
 
         RobotUnitDataStreamingReceiverPtr _streaming_handler;