diff --git a/media/libmedia/AudioSystem.cpp b/media/libmedia/AudioSystem.cpp
index 9d645f0..8b902a0 100644
--- a/media/libmedia/AudioSystem.cpp
+++ b/media/libmedia/AudioSystem.cpp
@@ -1136,7 +1136,7 @@
     return aps->getPhoneState();
 }
 
-status_t AudioSystem::registerPolicyMixes(Vector<AudioMix> mixes, bool registration)
+status_t AudioSystem::registerPolicyMixes(const Vector<AudioMix>& mixes, bool registration)
 {
     const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
     if (aps == 0) return PERMISSION_DENIED;