diff --git a/uppsrc/umk/Console.cpp b/uppsrc/umk/Console.cpp
index 4b5466fd9..27750a879 100644
--- a/uppsrc/umk/Console.cpp
+++ b/uppsrc/umk/Console.cpp
@@ -220,7 +220,7 @@ bool Console::Wait()
 	}
 }
 
-void Console::OnFinish(Callback cb)
+void Console::OnFinish(Event<> cb)
 {
 	Finisher& f = finisher.Add();
 	f.serial = serial;
diff --git a/uppsrc/umk/IdeContext.cpp b/uppsrc/umk/IdeContext.cpp
index 0822eea15..c2c9e3f25 100644
--- a/uppsrc/umk/IdeContext.cpp
+++ b/uppsrc/umk/IdeContext.cpp
@@ -87,7 +87,7 @@ bool Ide::IdeConsoleWait(int slot)
 	return true;
 }
 
-void Ide::IdeConsoleOnFinish(Callback cb)
+void Ide::IdeConsoleOnFinish(Event<> cb)
 {
 	console.OnFinish(cb);
 }
diff --git a/uppsrc/umk/umake.h b/uppsrc/umk/umake.h
index 3d6e4ac08..a3c675e95 100644
--- a/uppsrc/umk/umake.h
+++ b/uppsrc/umk/umake.h
@@ -37,7 +37,7 @@ protected:
 
 	struct Finisher {
 		int               serial;
-		Callback          cb;
+		Event<>           cb;
 	};
 
 	Array<Slot> processes;
@@ -78,7 +78,7 @@ public:
 	void Wait(int slot);
 	bool Wait();
 
-	void OnFinish(Callback cb);
+	void OnFinish(Event<> cb);
 
 	void WrapText(bool w)                     { wrap_text = w; }
 
@@ -115,7 +115,7 @@ struct Ide : public IdeContext, public MakeBuild {
 	virtual void             IdeConsoleEndGroup();
 	virtual bool             IdeConsoleWait();
 	virtual bool             IdeConsoleWait(int slot);
-	virtual void             IdeConsoleOnFinish(Callback cb);
+	virtual void             IdeConsoleOnFinish(Event<> cb);
 
 	virtual bool      IdeIsDebug() const ;
 	virtual void      IdeEndDebug();