diff --git a/samples/docview/docview.h b/samples/docview/docview.h
index 3cb7f8852d..c694031b2b 100644
--- a/samples/docview/docview.h
+++ b/samples/docview/docview.h
@@ -14,9 +14,7 @@
 
 #include "wx/docview.h"
 
-class MyFrame;
 class MyCanvas;
-class DrawingView;
 
 // Define a new application
 class MyApp : public wxApp