diff -r a27850958a67 -r 42d64bd73232 src/SimulatorWindow.cpp
--- a/src/SimulatorWindow.cpp	Thu Mar 14 16:11:08 2019 +0100
+++ b/src/SimulatorWindow.cpp	Thu Mar 14 16:46:16 2019 +0100
@@ -23,6 +23,9 @@
 
 #include "SimulatorWindow.h"
 
+Q_DECLARE_METATYPE(MotionEvent);
+Q_DECLARE_METATYPE(ButtonEvent);
+
 SimulatorWindow::SimulatorWindow() {
 	resize(640, 480);
 	setWindowTitle("Spacenav Simulator");
@@ -83,7 +86,6 @@
 
 QSlider* SimulatorWindow::createSlider(QWidget* parent) {
 	QSlider* slider = new QSlider(Qt::Orientation::Horizontal, parent);
-	rotations.push_back(slider);
 	slider->setRange(-500, 500);
 	slider->setValue(0);
 	slider->setTickPosition(QSlider::TicksBelow);