diff --git a/src/plugins/debugger/debuggerengine.h b/src/plugins/debugger/debuggerengine.h
index d6ca432a639..99ece70f586 100644
--- a/src/plugins/debugger/debuggerengine.h
+++ b/src/plugins/debugger/debuggerengine.h
@@ -46,7 +46,6 @@ QT_END_NAMESPACE
 
 namespace TextEditor { class ITextEditor; }
 namespace Core { class IOptionsPage; }
-namespace ProjectExplorer { class TaskHub; }
 
 namespace Debugger {
 
@@ -196,7 +195,6 @@ public:
 
     virtual void createSnapshot();
     virtual void updateAll();
-    ProjectExplorer::TaskHub *taskHub();
 
     typedef Internal::BreakpointModelId BreakpointModelId;
     virtual bool stateAcceptsBreakpointChanges() const { return true; }