diff --git a/include/wx/generic/dirctrlg.h b/include/wx/generic/dirctrlg.h
index 9eb1554035..26e8a0532d 100644
--- a/include/wx/generic/dirctrlg.h
+++ b/include/wx/generic/dirctrlg.h
@@ -14,7 +14,7 @@
 #ifndef _WX_DIRCTRL_H_
 #define _WX_DIRCTRL_H_
 
-#if wxUSE_DIRDLG
+#if wxUSE_DIRDLG || wxUSE_FILEDLG
 
 #include "wx/treectrl.h"
 #include "wx/dialog.h"
@@ -28,6 +28,8 @@
 class WXDLLIMPEXP_FWD_CORE wxTextCtrl;
 class WXDLLIMPEXP_FWD_BASE wxHashTable;
 
+extern WXDLLIMPEXP_DATA_CORE(const char) wxDirDialogDefaultFolderStr[];
+
 //-----------------------------------------------------------------------------
 // Extra styles for wxGenericDirCtrl
 //-----------------------------------------------------------------------------