diff --git a/src/plugins/coreplugin/mainwindow.cpp b/src/plugins/coreplugin/mainwindow.cpp
index 23b39ba8a03..04dc515d3be 100644
--- a/src/plugins/coreplugin/mainwindow.cpp
+++ b/src/plugins/coreplugin/mainwindow.cpp
@@ -894,18 +894,6 @@ void MainWindow::removeContextObject(IContext *context)
         updateContextObject(m_activeContext);
 }
 
-void MainWindow::changeEvent(QEvent *e)
-{
-    QMainWindow::changeEvent(e);
-    if (e->type() == QEvent::ActivationChange) {
-        if (isActiveWindow()) {
-            if (debugMainWindow)
-                qDebug() << "main window activated";
-            emit windowActivated();
-        }
-    }
-}
-
 void MainWindow::updateFocusWidget(QWidget *old, QWidget *now)
 {
     Q_UNUSED(old)
diff --git a/src/plugins/coreplugin/mainwindow.h b/src/plugins/coreplugin/mainwindow.h
index eb5794303c4..aeed763ebed 100644
--- a/src/plugins/coreplugin/mainwindow.h
+++ b/src/plugins/coreplugin/mainwindow.h
@@ -111,7 +111,6 @@ public:
     bool isNewItemDialogRunning() const;
 
 signals:
-    void windowActivated();
     void newItemDialogRunningChanged();
 
 public slots:
@@ -133,7 +132,6 @@ public slots:
                                 QWidget *parent = 0);
 
 protected:
-    virtual void changeEvent(QEvent *e);
     virtual void closeEvent(QCloseEvent *event);
 
 private slots: