1 files changed, 4 insertions, 1 deletions
diff --git a/src/plugins/windowsaudio/qwindowsaudioplugin.h b/src/plugins/windowsaudio/qwindowsaudioplugin.h
index fb4749e0d..7b500a39c 100644
--- a/src/plugins/windowsaudio/qwindowsaudioplugin.h
+++ b/src/plugins/windowsaudio/qwindowsaudioplugin.h
@@ -41,19 +41,22 @@
 #define QWINDOWSAUDIOPLUGIN_H
 
 #include <QtMultimedia/qaudiosystemplugin.h>
+#include <QtMultimedia/private/qaudiosystempluginext_p.h>
 
 QT_BEGIN_NAMESPACE
 
-class QWindowsAudioPlugin : public QAudioSystemPlugin
+class QWindowsAudioPlugin : public QAudioSystemPlugin, public QAudioSystemPluginExtension
 {
     Q_OBJECT
 
     Q_PLUGIN_METADATA(IID "org.qt-project.qt.audiosystemfactory/5.0" FILE "windowsaudio.json")
+    Q_INTERFACES(QAudioSystemPluginExtension)
 
 public:
     QWindowsAudioPlugin(QObject *parent = 0);
     ~QWindowsAudioPlugin() {}
 
+    QByteArray defaultDevice(QAudio::Mode mode) const Q_DECL_OVERRIDE;
     QList<QByteArray> availableDevices(QAudio::Mode mode) const Q_DECL_OVERRIDE;
     QAbstractAudioInput *createInput(const QByteArray &device) Q_DECL_OVERRIDE;
     QAbstractAudioOutput *createOutput(const QByteArray &device) Q_DECL_OVERRIDE;