diff --git a/EventMonitor/App.cpp b/EventMonitor/App.cpp
index f92dd8d..6fef987 100644
--- a/EventMonitor/App.cpp
+++ b/EventMonitor/App.cpp
@@ -70,9 +70,9 @@ bool wxEventMonitorApp::OnInit()
     }
 #endif
 
-    m_mainWnd = new wxEventMonitorFrame(NULL);
-    wxPersistentRegisterAndRestore<wxEventMonitorFrame>(m_mainWnd);
-    m_mainWnd->Show();
+    wxEventMonitorFrame *mainWnd = new wxEventMonitorFrame(NULL);
+    wxPersistentRegisterAndRestore<wxEventMonitorFrame>(mainWnd);
+    mainWnd->Show();
 
     return true;
 }
diff --git a/EventMonitor/App.h b/EventMonitor/App.h
index 9c88010..e318603 100644
--- a/EventMonitor/App.h
+++ b/EventMonitor/App.h
@@ -54,7 +54,6 @@ public:
     //virtual int OnExit();
 
 public:
-    wxEventMonitorFrame *m_mainWnd; ///< Main window
     wxLocale             m_locale;  ///< Current locale
 };