diff --git a/simulator_SIC_XE/gui/qt/mainwindow.cpp b/simulator_SIC_XE/gui/qt/mainwindow.cpp
index afc464c..45d5d37 100644
--- a/simulator_SIC_XE/gui/qt/mainwindow.cpp
+++ b/simulator_SIC_XE/gui/qt/mainwindow.cpp
@@ -99,9 +99,11 @@ MainWindow::MainWindow(QWidget *parent) :
     
     setupMemoryDisplay();
     setupDisassemblyDisplay();
+
+    loadInstructionSet();
     //loadDemoProgram();
-    g_loader = std::make_shared<Loader>(machine(), std::string(PATH_RESOURCES) + "demo_program.obj");
-    g_loader->load();
+    Loader loader(m_machine, std::string(PATH_RESOURCES) + "test.obj");
+    loader.load();
     
     updateRegisterDisplays();
     updateMemoryDisplay();