diff --git a/include/wx/defs.h b/include/wx/defs.h
index 76f97026d5..daa9d50598 100644
--- a/include/wx/defs.h
+++ b/include/wx/defs.h
@@ -3050,6 +3050,7 @@ DECLARE_WXCOCOA_OBJC_CLASS(NSMutableArray);
 DECLARE_WXCOCOA_OBJC_CLASS(NSNotification);
 DECLARE_WXCOCOA_OBJC_CLASS(NSObject);
 DECLARE_WXCOCOA_OBJC_CLASS(NSPanel);
+DECLARE_WXCOCOA_OBJC_CLASS(NSResponder);
 DECLARE_WXCOCOA_OBJC_CLASS(NSScrollView);
 DECLARE_WXCOCOA_OBJC_CLASS(NSSound);
 DECLARE_WXCOCOA_OBJC_CLASS(NSStatusItem);