diff --git a/include/wx/sizer.h b/include/wx/sizer.h
index 7a2ce17ff3..c4795d4c81 100644
--- a/include/wx/sizer.h
+++ b/include/wx/sizer.h
@@ -198,6 +198,8 @@ protected:
 // wxNotebookSizer
 //---------------------------------------------------------------------------
 
+#if wxUSE_NOTEBOOK
+
 class WXDLLEXPORT wxNotebookSizer: public wxSizer
 {
     DECLARE_CLASS(wxNotebookSizer);
@@ -214,5 +216,8 @@ protected:
    wxNotebook   *m_notebook;
 };
 
+#endif
+
+
 #endif
   // __WXSIZER_H__