diff --git a/a8/types.h b/a8/types.h
index 81d42e5..fae2588 100644
--- a/a8/types.h
+++ b/a8/types.h
@@ -29,6 +29,7 @@ namespace a8
     };
 
     typedef std::function<void(const a8::Args&)> CommonCbProc;
+    typedef std::function<void(const a8::Args*)> CommonCbProcEx;
     typedef std::weak_ptr<struct XTimerPtr> XTimerWp;
 
     const int INVALID_FD = -1;