diff --git a/src/win32/MainWnd.cpp b/src/win32/MainWnd.cpp
index f9db5f1c..10e08a6d 100644
--- a/src/win32/MainWnd.cpp
+++ b/src/win32/MainWnd.cpp
@@ -361,7 +361,6 @@ BEGIN_MESSAGE_MAP(MainWnd, CWnd)
   ON_WM_MOUSEMOVE()
   ON_WM_INITMENU()
   ON_WM_ACTIVATE()
-  ON_WM_ACTIVATEAPP()
   ON_WM_DROPFILES()
   ON_COMMAND(ID_FILE_SAVEGAME_OLDESTSLOT, OnFileSavegameOldestslot)
   ON_UPDATE_COMMAND_UI(ID_FILE_SAVEGAME_OLDESTSLOT, OnUpdateFileSavegameOldestslot)
@@ -1280,22 +1279,6 @@ void MainWnd::OnActivate(UINT nState, CWnd* pWndOther, BOOL bMinimized)
   }
 }
 
-#if _MSC_VER <= 1200
-void MainWnd::OnActivateApp(BOOL bActive, HTASK hTask)
-#else
-void MainWnd::OnActivateApp(BOOL bActive, DWORD hTask)
-#endif
-{
-  CWnd::OnActivateApp(bActive, hTask);
-
-  if(theApp.tripleBuffering && theApp.videoOption > VIDEO_4X) {
-    if(bActive) {
-      if(theApp.display)
-        theApp.display->clear();
-    }
-  }
-}
-
 void MainWnd::OnDropFiles(HDROP hDropInfo)
 {
   char szFile[1024];
diff --git a/src/win32/MainWnd.h b/src/win32/MainWnd.h
index 3cf22f43..f8e12357 100644
--- a/src/win32/MainWnd.h
+++ b/src/win32/MainWnd.h
@@ -400,11 +400,6 @@ class MainWnd : public CWnd
   afx_msg void OnMouseMove(UINT nFlags, CPoint point);
   afx_msg void OnInitMenu(CMenu* pMenu);
   afx_msg void OnActivate(UINT nState, CWnd* pWndOther, BOOL bMinimized);
-#if _MSC_VER <= 1200
-  afx_msg void OnActivateApp(BOOL bActive, HTASK hTask);
-#else
-  afx_msg void OnActivateApp(BOOL bActive, DWORD hTask);
-#endif
   afx_msg void OnDropFiles(HDROP hDropInfo);
   afx_msg void OnFileSavegameOldestslot();
   afx_msg void OnUpdateFileSavegameOldestslot(CCmdUI* pCmdUI);