diff --git a/include/media/AudioSystem.h b/include/media/AudioSystem.h
index 2e6646a..2174b2f 100644
--- a/include/media/AudioSystem.h
+++ b/include/media/AudioSystem.h
@@ -326,7 +326,7 @@
 
     static audio_mode_t getPhoneState();
 
-    static status_t registerPolicyMixes(Vector<AudioMix> mixes, bool registration);
+    static status_t registerPolicyMixes(const Vector<AudioMix>& mixes, bool registration);
 
     static status_t startAudioSource(const struct audio_port_config *source,
                                       const audio_attributes_t *attributes,