diff --git a/media/libmedia/IAudioPolicyService.cpp b/media/libmedia/IAudioPolicyService.cpp
index 20d23d0..946da8a 100644
--- a/media/libmedia/IAudioPolicyService.cpp
+++ b/media/libmedia/IAudioPolicyService.cpp
@@ -704,7 +704,7 @@
         return (audio_mode_t)reply.readInt32();
     }
 
-    virtual status_t registerPolicyMixes(Vector<AudioMix> mixes, bool registration)
+    virtual status_t registerPolicyMixes(const Vector<AudioMix>& mixes, bool registration)
     {
         Parcel data, reply;
         data.writeInterfaceToken(IAudioPolicyService::getInterfaceDescriptor());