diff --git a/include/wx/dialog.h b/include/wx/dialog.h
index 49454a1ef7..95e6b6f99e 100644
--- a/include/wx/dialog.h
+++ b/include/wx/dialog.h
@@ -11,8 +11,8 @@
 #ifndef _WX_DIALOG_H_BASE_
 #define _WX_DIALOG_H_BASE_
 
-#include "wx/defs.h"
 #include "wx/toplevel.h"
+#include "wx/containr.h"
 
 class WXDLLIMPEXP_FWD_CORE wxSizer;
 class WXDLLIMPEXP_FWD_CORE wxStdDialogButtonSizer;
@@ -64,7 +64,7 @@ enum wxDialogModality
 
 extern WXDLLIMPEXP_DATA_CORE(const char) wxDialogNameStr[];
 
-class WXDLLIMPEXP_CORE wxDialogBase : public wxTopLevelWindow
+class WXDLLIMPEXP_CORE wxDialogBase : public wxNavigationEnabled<wxTopLevelWindow>
 {
 public:
     wxDialogBase();
diff --git a/include/wx/toplevel.h b/include/wx/toplevel.h
index 38170ec5e4..b36b30e6cf 100644
--- a/include/wx/toplevel.h
+++ b/include/wx/toplevel.h
@@ -19,7 +19,6 @@
 
 #include "wx/nonownedwnd.h"
 #include "wx/iconbndl.h"
-#include "wx/containr.h"
 #include "wx/weakref.h"
 
 // the default names for various classes
@@ -156,8 +155,7 @@ enum
 // wxTopLevelWindow: a top level (as opposed to child) window
 // ----------------------------------------------------------------------------
 
-class WXDLLIMPEXP_CORE wxTopLevelWindowBase :
-    public wxNavigationEnabled<wxNonOwnedWindow>
+class WXDLLIMPEXP_CORE wxTopLevelWindowBase : public wxNonOwnedWindow
 {
 public:
     // construction