diff --git a/src/motif/popupwin.cpp b/src/motif/popupwin.cpp
index 8d4ce0915d..5c59c1a08b 100644
--- a/src/motif/popupwin.cpp
+++ b/src/motif/popupwin.cpp
@@ -29,8 +29,6 @@
 
 #include "wx/motif/private.h"
 
-IMPLEMENT_DYNAMIC_CLASS( wxPopupWindow, wxWindow );
-
 bool wxPopupWindow::Create( wxWindow *parent, int flags )
 {
     if( !wxPopupWindowBase::Create( parent, flags ) )