diff --git a/include/wx/defs.h b/include/wx/defs.h
index f991cbe8a1..3dcfa9e09a 100644
--- a/include/wx/defs.h
+++ b/include/wx/defs.h
@@ -2095,6 +2095,7 @@ DECLARE_WXCOCOA_OBJC_CLASS(NSLayoutManager);
 DECLARE_WXCOCOA_OBJC_CLASS(NSMenu);
 DECLARE_WXCOCOA_OBJC_CLASS(NSMenuItem);
 DECLARE_WXCOCOA_OBJC_CLASS(NSMutableArray);
+DECLARE_WXCOCOA_OBJC_CLASS(NSNotification);
 DECLARE_WXCOCOA_OBJC_CLASS(NSPanel);
 DECLARE_WXCOCOA_OBJC_CLASS(NSScrollView);
 DECLARE_WXCOCOA_OBJC_CLASS(NSTableColumn);