diff --git a/include/media/IAudioPolicyService.h b/include/media/IAudioPolicyService.h
index 0e9e3bc..ef15a0c 100644
--- a/include/media/IAudioPolicyService.h
+++ b/include/media/IAudioPolicyService.h
@@ -160,7 +160,7 @@
 
     virtual audio_mode_t getPhoneState() = 0;
 
-    virtual status_t registerPolicyMixes(Vector<AudioMix> mixes, bool registration) = 0;
+    virtual status_t registerPolicyMixes(const Vector<AudioMix>& mixes, bool registration) = 0;
 
     virtual status_t startAudioSource(const struct audio_port_config *source,
                                       const audio_attributes_t *attributes,