diff --git a/Plugins/org.mitk.gui.qt.ext/src/internal/QmitkAppInstancesPreferencePage.cpp b/Plugins/org.mitk.gui.qt.ext/src/internal/QmitkAppInstancesPreferencePage.cpp
index 30b3422b74..1fc1168d01 100644
--- a/Plugins/org.mitk.gui.qt.ext/src/internal/QmitkAppInstancesPreferencePage.cpp
+++ b/Plugins/org.mitk.gui.qt.ext/src/internal/QmitkAppInstancesPreferencePage.cpp
@@ -1,75 +1,75 @@
 /*============================================================================
 
 The Medical Imaging Interaction Toolkit (MITK)
 
 Copyright (c) German Cancer Research Center (DKFZ)
 All rights reserved.
 
 Use of this source code is governed by a 3-clause BSD license that can be
 found in the LICENSE file.
 
 ============================================================================*/
 
 #include "QmitkAppInstancesPreferencePage.h"
+#include <ui_QmitkAppInstancesPreferencePage.h>
 
 #include <mitkCoreServices.h>
 #include <mitkIPreferencesService.h>
 #include <mitkIPreferences.h>
 
 namespace
 {
   mitk::IPreferences* GetPreferences()
   {
     auto* preferencesService = mitk::CoreServices::GetPreferencesService();
     return preferencesService->GetSystemPreferences()->Node("General");
   }
 }
 
 QmitkAppInstancesPreferencePage::QmitkAppInstancesPreferencePage()
+  : controls(new Ui::QmitkAppInstancesPreferencePage)
 {
-
 }
 
 void QmitkAppInstancesPreferencePage::Init(berry::IWorkbench::Pointer )
 {
-
 }
 
 void QmitkAppInstancesPreferencePage::CreateQtControl(QWidget* parent)
 {
   mainWidget = new QWidget(parent);
-  controls.setupUi(mainWidget);
+  controls->setupUi(mainWidget);
 
   Update();
 }
 
 QWidget* QmitkAppInstancesPreferencePage::GetQtControl() const
 {
   return mainWidget;
 }
 
 bool QmitkAppInstancesPreferencePage::PerformOk()
 {
   auto* prefs = GetPreferences();
 
-  prefs->PutBool("newInstance.always", controls.newInstanceAlways->isChecked());
-  prefs->PutBool("newInstance.scene", controls.newInstanceScene->isChecked());
+  prefs->PutBool("newInstance.always", controls->newInstanceAlways->isChecked());
+  prefs->PutBool("newInstance.scene", controls->newInstanceScene->isChecked());
 
   return true;
 }
 
 void QmitkAppInstancesPreferencePage::PerformCancel()
 {
 
 }
 
 void QmitkAppInstancesPreferencePage::Update()
 {
   auto* prefs = GetPreferences();
 
   bool always = prefs->GetBool("newInstance.always", false);
   bool scene = prefs->GetBool("newInstance.scene", true);
 
-  controls.newInstanceAlways->setChecked(always);
-  controls.newInstanceScene->setChecked(scene);
+  controls->newInstanceAlways->setChecked(always);
+  controls->newInstanceScene->setChecked(scene);
 }
diff --git a/Plugins/org.mitk.gui.qt.ext/src/internal/QmitkAppInstancesPreferencePage.h b/Plugins/org.mitk.gui.qt.ext/src/internal/QmitkAppInstancesPreferencePage.h
index 64e2162497..5a154f0d97 100644
--- a/Plugins/org.mitk.gui.qt.ext/src/internal/QmitkAppInstancesPreferencePage.h
+++ b/Plugins/org.mitk.gui.qt.ext/src/internal/QmitkAppInstancesPreferencePage.h
@@ -1,47 +1,49 @@
 /*============================================================================
 
 The Medical Imaging Interaction Toolkit (MITK)
 
 Copyright (c) German Cancer Research Center (DKFZ)
 All rights reserved.
 
 Use of this source code is governed by a 3-clause BSD license that can be
 found in the LICENSE file.
 
 ============================================================================*/
 
 
 #ifndef QmitkAppInstancesPreferencePage_h
 #define QmitkAppInstancesPreferencePage_h
 
 #include <berryIQtPreferencePage.h>
 
-#include <ui_QmitkAppInstancesPreferencePage.h>
+namespace Ui
+{
+  class QmitkAppInstancesPreferencePage;
+}
 
 class QmitkAppInstancesPreferencePage : public QObject, public berry::IQtPreferencePage
 {
 
   Q_OBJECT
   Q_INTERFACES(berry::IPreferencePage)
 
 public:
 
   QmitkAppInstancesPreferencePage();
-  QmitkAppInstancesPreferencePage(const QmitkAppInstancesPreferencePage& other);
 
   void Init(berry::IWorkbench::Pointer workbench) override;
 
   void CreateQtControl(QWidget* parent) override;
   QWidget* GetQtControl() const override;
 
   bool PerformOk() override;
   void PerformCancel() override;
   void Update() override;
 
 private:
 
-  Ui::QmitkAppInstancesPreferencePage controls;
+  Ui::QmitkAppInstancesPreferencePage* controls;
   QWidget* mainWidget;
 };
 
 #endif