diff --git a/include/wx/msw/popupwin.h b/include/wx/msw/popupwin.h
index 297c0e7991..239ee04212 100644
--- a/include/wx/msw/popupwin.h
+++ b/include/wx/msw/popupwin.h
@@ -42,6 +42,8 @@ protected:
 
         GetParent()->ClientToScreen(x, y);
     }
+
+    DECLARE_DYNAMIC_CLASS(wxPopupWindow)
 };
 
 #endif // _WX_MSW_POPUPWIN_H_
diff --git a/src/common/popupcmn.cpp b/src/common/popupcmn.cpp
index 581d20333d..55dcc2daa9 100644
--- a/src/common/popupcmn.cpp
+++ b/src/common/popupcmn.cpp
@@ -40,6 +40,12 @@
     #include "wx/univ/renderer.h"
 #endif // __WXUNIVERSAL__
 
+// there is no src/msw/popupwin.cpp to put this in, so we do it here - BTW we
+// probably could do it for all ports here just as well
+#ifdef __WXMSW__
+    IMPLEMENT_DYNAMIC_CLASS(wxPopupWindow, wxWindow)
+#endif // __WXMSW__
+
 // ----------------------------------------------------------------------------
 // private classes
 // ----------------------------------------------------------------------------
@@ -354,3 +360,4 @@ void wxPopupFocusHandler::OnKillFocus(wxFocusEvent& event)
 }
 
 #endif // wxUSE_POPUPWIN
+