diff --git a/uppsrc/Core/CoWork.h b/uppsrc/Core/CoWork.h
index cffa24d84..5cb4d35ec 100644
--- a/uppsrc/Core/CoWork.h
+++ b/uppsrc/Core/CoWork.h
@@ -46,10 +46,8 @@ public:
 	
 public:
 	void     Do(Function<void ()>&& fn);
-	void     Do(const Callback& cb)                           { Do(Function<void ()>(clone(cb))); }
 	void     Do(const Function<void ()>& fn)                  { Do(clone(fn)); }
 
-	CoWork&  operator&(const Callback& cb)                    { Do(cb); return *this; }
 	CoWork&  operator&(const Function<void ()>& fn)           { Do(fn); return *this; }
 	CoWork&  operator&(Function<void ()>&& fn)                { Do(pick(fn)); return *this; }