diff --git a/samples/mdi/mdi.cpp b/samples/mdi/mdi.cpp
index a915f7fffb..a74fc0742c 100644
--- a/samples/mdi/mdi.cpp
+++ b/samples/mdi/mdi.cpp
@@ -324,7 +324,7 @@ void MyFrame::InitToolBar(wxToolBar* toolBar)
     toolBar->AddTool(6, *bitmaps[6], wxNullBitmap, FALSE, currentX, -1, (wxObject *) NULL, _T("Print"));
     currentX += width + 5;
     toolBar->AddSeparator();
-    toolBar->AddTool(7, *bitmaps[7], wxNullBitmap, TRUE, currentX, -1, (wxObject *) NULL, _T("Help"));
+    toolBar->AddTool(MDI_ABOUT, *bitmaps[7], wxNullBitmap, TRUE, currentX, -1, (wxObject *) NULL, _T("Help"));
 
     toolBar->Realize();