diff --git a/guilib/include/rtabmap/gui/MainWindow.h b/guilib/include/rtabmap/gui/MainWindow.h
index e23d383f..cc227e29 100644
--- a/guilib/include/rtabmap/gui/MainWindow.h
+++ b/guilib/include/rtabmap/gui/MainWindow.h
@@ -308,8 +308,8 @@ protected:
 	virtual Camera * createCamera(
 			Camera ** odomSensor,
 			Transform & odomSensorExtrinsics,
-			double odomSensorTimeOffset,
-			float odomSensorScaleFactor);
+			double & odomSensorTimeOffset,
+			float & odomSensorScaleFactor);
 
 private:
 	Ui_mainWindow * _ui;
diff --git a/guilib/src/MainWindow.cpp b/guilib/src/MainWindow.cpp
index 0044ba0a..62f68554 100644
--- a/guilib/src/MainWindow.cpp
+++ b/guilib/src/MainWindow.cpp
@@ -5356,8 +5356,8 @@ void MainWindow::editDatabase()
 Camera * MainWindow::createCamera(
 		Camera ** odomSensor,
 		Transform & odomSensorExtrinsics,
-		double odomSensorTimeOffset,
-		float odomSensorScaleFactor)
+		double & odomSensorTimeOffset,
+		float & odomSensorScaleFactor)
 {
 	Camera * camera = _preferencesDialog->createCamera();