diff --git a/animations/stackedlayout.cpp b/animations/stackedlayout.cpp
index 2641de211..29ec0b637 100644
--- a/animations/stackedlayout.cpp
+++ b/animations/stackedlayout.cpp
@@ -21,7 +21,9 @@
 #include <QDebug>
 
 StackedLayout::StackedLayout(QGraphicsLayoutItem *parent)
-    : QObject(0), m_currentWidgetIndex(-1), QGraphicsLayout(parent)
+    : QObject(0),
+      QGraphicsLayout(parent),
+      m_currentWidgetIndex(-1)
 {
 }
 
diff --git a/animations/stackedlayout.h b/animations/stackedlayout.h
index 9a0d534f8..77de9ccbc 100644
--- a/animations/stackedlayout.h
+++ b/animations/stackedlayout.h
@@ -24,8 +24,10 @@
 
 class StackedLayout : public QObject, public QGraphicsLayout
 {
-Q_OBJECT
-    public:
+    Q_OBJECT
+    Q_INTERFACES(QGraphicsLayout)
+
+public:
         explicit StackedLayout(QGraphicsLayoutItem *parent = 0);
         ~StackedLayout();