diff --git a/src/declarative/qml/qdeclarativeenginedebug.cpp b/src/declarative/qml/qdeclarativeenginedebug.cpp
index ed28185..eabc298 100644
--- a/src/declarative/qml/qdeclarativeenginedebug.cpp
+++ b/src/declarative/qml/qdeclarativeenginedebug.cpp
@@ -52,6 +52,9 @@
 #include "private/qdeclarativevaluetype_p.h"
 #include "private/qdeclarativevmemetaobject_p.h"
 #include "private/qdeclarativeexpression_p.h"
+#include "qabstractanimation.h"
+#include "private/qabstractanimation_p.h"
+
 
 #include <QtCore/qdebug.h>
 #include <QtCore/qmetaobject.h>
@@ -484,6 +487,10 @@ void QDeclarativeEngineDebugServer::messageReceived(const QByteArray &message)
         QString methodBody;
         ds >> objectId >> methodName >> methodBody;
         setMethodBody(objectId, methodName, methodBody);
+    } else if (type == "SET_ANIM_SLOWDOWN_FACTOR") {
+        qreal slowdownFactor;
+        ds >> slowdownFactor;
+        setSlowdownFactor(slowdownFactor);
     }
 }
 
@@ -578,6 +585,19 @@ void QDeclarativeEngineDebugServer::setMethodBody(int objectId, const QString &m
     vmeMetaObject->setVmeMethod(prop->coreIndex, QDeclarativeExpressionPrivate::evalInObjectScope(contextData, object, jsfunction, contextData->url.toString(), lineNumber, 0));
 }
 
+void QDeclarativeEngineDebugServer::setSlowdownFactor(qreal slowdownFactor)
+{
+    QUnifiedTimer *timer = QUnifiedTimer::instance();
+    if (slowdownFactor == 0) {
+        timer->setSlowdownFactor(0);
+        timer->setSlowModeEnabled(true);
+    } else {
+        bool slowModeEnabled = (slowdownFactor != 1.0f);
+        timer->setSlowdownFactor(slowdownFactor);
+        timer->setSlowModeEnabled(slowModeEnabled);
+    }
+}
+
 void QDeclarativeEngineDebugServer::propertyChanged(int id, int objectId, const QMetaProperty &property, const QVariant &value)
 {
     QByteArray reply;
diff --git a/src/declarative/qml/qdeclarativeenginedebug_p.h b/src/declarative/qml/qdeclarativeenginedebug_p.h
index 613f1fe..4137b89 100644
--- a/src/declarative/qml/qdeclarativeenginedebug_p.h
+++ b/src/declarative/qml/qdeclarativeenginedebug_p.h
@@ -113,6 +113,7 @@ private:
     void setBinding(int objectId, const QString &propertyName, const QVariant &expression, bool isLiteralValue);
     void resetBinding(int objectId, const QString &propertyName);
     void setMethodBody(int objectId, const QString &method, const QString &body);
+    void setSlowdownFactor(qreal animationSpeed);
 
     QList<QDeclarativeEngine *> m_engines;
     QDeclarativeWatcher *m_watch;