diff --git a/src/kdeclarative/CMakeLists.txt b/src/kdeclarative/CMakeLists.txt
--- a/src/kdeclarative/CMakeLists.txt
+++ b/src/kdeclarative/CMakeLists.txt
@@ -6,7 +6,6 @@
   kdeclarative.cpp
   private/kiconprovider.cpp
   private/kioaccessmanagerfactory.cpp
-  private/qmlobject_p.h
 )
 
 add_library(KF5Declarative ${kdeclarative_SRCS})
diff --git a/src/kdeclarative/private/qmlobject_p.h b/src/kdeclarative/private/qmlobject_p.h
deleted file mode 100644
--- a/src/kdeclarative/private/qmlobject_p.h
+++ /dev/null
@@ -1,89 +0,0 @@
-/*
- *   Copyright 2013 Marco Martin <mart@kde.org>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU Library General Public License as
- *   published by the Free Software Foundation; either version 2, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details
- *
- *   You should have received a copy of the GNU Library General Public
- *   License along with this program; if not, write to the
- *   Free Software Foundation, Inc.,
- *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
- */
-
-#ifndef QMLOBJECT_P_H
-#define QMLOBJECT_P_H
-
-#include <QObject>
-#include <QQmlIncubationController>
-
-#include <QWindow>
-#include <QAnimationDriver>
-#include <QGuiApplication>
-#include <QScreen>
-
-class QQmlEngine;
-class QQmlComponent;
-
-namespace KDeclarative {
-
-class QmlObjectIncubationController : public QObject, public QQmlIncubationController
-{
-    Q_OBJECT
-
-public:
-    QmlObjectIncubationController(QObject *parent)
-        : QObject(parent),
-          QQmlIncubationController()
-    {
-        // Allow incubation for 1/3 of a frame.
-        m_incubation_time = qMax(1, int(1000 / QGuiApplication::primaryScreen()->refreshRate()) / 3);
-    }
-
-protected:
-    bool event(QEvent *e) Q_DECL_OVERRIDE
-    {
-        if (e->type() == QEvent::User) {
-            incubate();
-            return true;
-        }
-        return QObject::event(e);
-    }
-
-public Q_SLOTS:
-    void incubate()
-    {
-        if (incubatingObjectCount()) {
-            incubateFor(m_incubation_time * 2);
-            if (incubatingObjectCount()) {
-                QCoreApplication::postEvent(this, new QEvent(QEvent::User));
-            }
-        }
-    }
-
-    void animationStopped()
-    {
-        incubate();
-    }
-
-protected:
-    void incubatingObjectCountChanged(int count) Q_DECL_OVERRIDE
-    {
-        if (count) {
-            incubate();
-        }
-        QQmlIncubationController::incubatingObjectCountChanged(count);
-    }
-private:
-    int m_incubation_time;
-};
-
-}
-
-#endif // multiple inclusion guard
diff --git a/src/kdeclarative/qmlobject.cpp b/src/kdeclarative/qmlobject.cpp
--- a/src/kdeclarative/qmlobject.cpp
+++ b/src/kdeclarative/qmlobject.cpp
@@ -18,7 +18,6 @@
  */
 
 #include "qmlobject.h"
-#include "private/qmlobject_p.h"
 #include "private/kdeclarative_p.h"
 
 #include <QQmlComponent>
@@ -151,7 +150,6 @@
     d->kdeclarative.d->qmlObj = this;
     //binds things like kconfig and icons
     d->kdeclarative.setupBindings();
-    d->engine->setIncubationController(new QmlObjectIncubationController(this));
 }
 
 QmlObject::QmlObject(QQmlEngine *engine, QObject *parent)
@@ -162,7 +160,6 @@
         d->engine = engine;
     } else {
         d->engine = new QQmlEngine(this);
-        d->engine->setIncubationController(new QmlObjectIncubationController(this));
     }
     d->rootContext = d->engine->rootContext();
     d->kdeclarative.setDeclarativeEngine(d->engine);
@@ -179,7 +176,6 @@
         d->engine = engine;
     } else {
         d->engine = new QQmlEngine(this);
-        d->engine->setIncubationController(new QmlObjectIncubationController(0));
     }
 
     if (rootContext) {
diff --git a/src/kdeclarative/qmlobjectsharedengine.cpp b/src/kdeclarative/qmlobjectsharedengine.cpp
--- a/src/kdeclarative/qmlobjectsharedengine.cpp
+++ b/src/kdeclarative/qmlobjectsharedengine.cpp
@@ -18,7 +18,6 @@
  */
 
 #include "qmlobjectsharedengine.h"
-#include "private/qmlobject_p.h"
 
 #include <QQmlComponent>
 #include <QQmlEngine>
@@ -54,7 +53,6 @@
     {
         if (!s_engine) {
             s_engine = std::make_shared<QQmlEngine>();
-            s_engine->setIncubationController(new QmlObjectIncubationController(0));            
         }
         return s_engine.get();
     }