diff --git a/include/wx/generic/dirdlgg.h b/include/wx/generic/dirdlgg.h
index 190b90e715..f3377ed0cf 100644
--- a/include/wx/generic/dirdlgg.h
+++ b/include/wx/generic/dirdlgg.h
@@ -82,6 +82,7 @@ protected:
     wxTextCtrl*       m_input;
 
     DECLARE_EVENT_TABLE()
+    DECLARE_DYNAMIC_CLASS(wxGenericDirDialog)
 };
 
 #endif // _WX_DIRDLGG_H_
diff --git a/src/generic/dirdlgg.cpp b/src/generic/dirdlgg.cpp
index d7c41a3386..b73214e6b7 100644
--- a/src/generic/dirdlgg.cpp
+++ b/src/generic/dirdlgg.cpp
@@ -45,6 +45,8 @@
 // wxGenericDirDialog
 //-----------------------------------------------------------------------------
 
+IMPLEMENT_DYNAMIC_CLASS(wxGenericDirDialog, wxDialog)
+
 static const int ID_DIRCTRL = 1000;
 static const int ID_TEXTCTRL = 1001;
 static const int ID_OK = 1002;