diff --git a/src/plugins/coreplugin/mainwindow.cpp b/src/plugins/coreplugin/mainwindow.cpp
index fa88a18f198..fd0d9ff5242 100644
--- a/src/plugins/coreplugin/mainwindow.cpp
+++ b/src/plugins/coreplugin/mainwindow.cpp
@@ -188,12 +188,16 @@ MainWindow::MainWindow() :
 #if defined(Q_OS_UNIX) && !defined(Q_OS_MAC)
     if (baseName == QLatin1String("windows")) {
         // Sometimes we get the standard windows 95 style as a fallback
-        // e.g. if we are running on a KDE4 desktop
-        QByteArray desktopEnvironment = qgetenv("DESKTOP_SESSION");
-        if (desktopEnvironment == "kde")
-            baseName = QLatin1String("plastique");
-        else
-            baseName = QLatin1String("cleanlooks");
+        if (QStyleFactory::keys().contains("Fusion"))
+            baseName = QLatin1String("fusion"); // Qt5
+        else { // Qt4
+            // e.g. if we are running on a KDE4 desktop
+            QByteArray desktopEnvironment = qgetenv("DESKTOP_SESSION");
+            if (desktopEnvironment == "kde")
+                baseName = QLatin1String("plastique");
+            else
+                baseName = QLatin1String("cleanlooks");
+        }
     }
 #endif
     qApp->setStyle(new ManhattanStyle(baseName));
diff --git a/src/plugins/qmldesigner/components/propertyeditor/basicwidgets.cpp b/src/plugins/qmldesigner/components/propertyeditor/basicwidgets.cpp
index 99c35b2c3fe..bce089c94d2 100644
--- a/src/plugins/qmldesigner/components/propertyeditor/basicwidgets.cpp
+++ b/src/plugins/qmldesigner/components/propertyeditor/basicwidgets.cpp
@@ -44,53 +44,43 @@
 #include <QDebug>
 #include <QApplication>
 #include <QGraphicsOpacityEffect>
-#if QT_VERSION >= 0x050000
-#  include <QFusionStyle>
-#else
-#  include <QCleanlooksStyle>
-#  include <QPlastiqueStyle>
-#endif
+#include <QWindowsStyle>
+
 #include <QTextEdit>
 
 
 QT_BEGIN_NAMESPACE
 
-class CleanLooksSingleton
+class WindowsStyleSingleton
 {
    public:
-     static CleanLooksSingleton* instance();
+     static WindowsStyleSingleton* instance();
      QStyle* style() {return &m_style; };
 
    private:
-     static CleanLooksSingleton *m_instance;
+     static WindowsStyleSingleton *m_instance;
 
-#if QT_VERSION >= 0x050000
-     QFusionStyle m_style;
-#elif defined(Q_OS_MAC)
-     QPlastiqueStyle m_style;
-#else
-     QCleanlooksStyle m_style;
-#endif
+     QWindowsStyle m_style;
 
-     CleanLooksSingleton() {}
-     CleanLooksSingleton( const CleanLooksSingleton& );
+     WindowsStyleSingleton() {}
+     WindowsStyleSingleton( const WindowsStyleSingleton& );
 
-     class CleanLooksWatcher {
-         public: ~CleanLooksWatcher() {
-           if( CleanLooksSingleton::m_instance != 0 )
-             delete CleanLooksSingleton::m_instance;
+     class WindowsWatcher {
+         public: ~WindowsWatcher() {
+           if ( WindowsStyleSingleton::m_instance != 0 )
+             delete WindowsStyleSingleton::m_instance;
          }
      };
-     friend class CleanLooksWatcher;
+     friend class WindowsWatcher;
 };
 
-CleanLooksSingleton* CleanLooksSingleton::m_instance = 0;
+WindowsStyleSingleton* WindowsStyleSingleton::m_instance = 0;
 
-CleanLooksSingleton* CleanLooksSingleton::instance()
+WindowsStyleSingleton* WindowsStyleSingleton::instance()
 {
-  static CleanLooksWatcher w;
+  static WindowsWatcher w;
   if( m_instance == 0 )
-    m_instance = new CleanLooksSingleton();
+    m_instance = new WindowsStyleSingleton();
   return m_instance;
 }
 
@@ -175,7 +165,7 @@ public:
         filter->setDuiTarget(this);
         m_mouseOver = false;
         q->installEventFilter(filter);
-        q->setStyle(CleanLooksSingleton::instance()->style());
+        q->setStyle(WindowsStyleSingleton::instance()->style());
         Q_ASSERT(q);
     }
     virtual ~QWidgetDeclarativeUI() {