diff --git a/src/imports/audioengine/qdeclarative_sound_p.cpp b/src/imports/audioengine/qdeclarative_sound_p.cpp
index b5f7a7b4..fcbd76f7 100644
--- a/src/imports/audioengine/qdeclarative_sound_p.cpp
+++ b/src/imports/audioengine/qdeclarative_sound_p.cpp
@@ -320,7 +320,7 @@ QDeclarativePlayVariation* QDeclarativeSound::getVariation(int index)
     return m_playlist[index];
 }
 
-void QDeclarativeSound::setAttenuationModel(QString attenuationModel)
+void QDeclarativeSound::setAttenuationModel(const QString &attenuationModel)
 {
     if (m_complete) {
         qWarning("Sound: attenuationModel not changeable after initialization.");
diff --git a/src/imports/audioengine/qdeclarative_sound_p.h b/src/imports/audioengine/qdeclarative_sound_p.h
index faf50a40..14ebd103 100644
--- a/src/imports/audioengine/qdeclarative_sound_p.h
+++ b/src/imports/audioengine/qdeclarative_sound_p.h
@@ -112,7 +112,7 @@ public:
     void setName(const QString& name);
 
     QString attenuationModel() const;
-    void setAttenuationModel(QString attenuationModel);
+    void setAttenuationModel(const QString &attenuationModel);
 
     QDeclarativeSoundCone* cone() const;