diff --git a/include/wx/generic/numdlgg.h b/include/wx/generic/numdlgg.h
index a5f24a9780..ce9ea55e86 100644
--- a/include/wx/generic/numdlgg.h
+++ b/include/wx/generic/numdlgg.h
@@ -60,6 +60,7 @@ protected:
 
 private:
     DECLARE_EVENT_TABLE()
+    DECLARE_DYNAMIC_CLASS(wxNumberEntryDialog)
     DECLARE_NO_COPY_CLASS(wxNumberEntryDialog)
 };
 
diff --git a/src/generic/numdlgg.cpp b/src/generic/numdlgg.cpp
index 2cbcc03ac1..e9ef27266a 100644
--- a/src/generic/numdlgg.cpp
+++ b/src/generic/numdlgg.cpp
@@ -71,6 +71,8 @@ BEGIN_EVENT_TABLE(wxNumberEntryDialog, wxDialog)
     EVT_BUTTON(wxID_CANCEL, wxNumberEntryDialog::OnCancel)
 END_EVENT_TABLE()
 
+IMPLEMENT_CLASS(wxNumberEntryDialog, wxDialog)
+
 wxNumberEntryDialog::wxNumberEntryDialog(wxWindow *parent,
                                          const wxString& message,
                                          const wxString& prompt,