diff --git a/src/common/dlgcmn.cpp b/src/common/dlgcmn.cpp
index 89880c8262..d53ee12801 100644
--- a/src/common/dlgcmn.cpp
+++ b/src/common/dlgcmn.cpp
@@ -470,6 +470,8 @@ void wxDialogBase::OnButton(wxCommandEvent& event)
 
 wxDEFINE_EVENT( wxEVT_WINDOW_MODAL_DIALOG_CLOSED , wxWindowModalDialogEvent  );
 
+IMPLEMENT_DYNAMIC_CLASS(wxWindowModalDialogEvent, wxCommandEvent)
+
 bool wxDialogBase::ShowWindowModal ()
 {
     ShowModal();