diff --git a/include/media/MmapStreamInterface.h b/include/media/MmapStreamInterface.h
index 0196a0c..b3bf16d 100644
--- a/include/media/MmapStreamInterface.h
+++ b/include/media/MmapStreamInterface.h
@@ -107,12 +107,15 @@
      * createMmapBuffer() must be called before calling start()
      *
      * \param[in] client a AudioClient struct describing the client starting on this stream.
+     * \param[in] attr audio attributes provided by the client.
      * \param[out] handle unique handle for this instance. Used with stop().
      * \return OK in case of success.
      *         NO_INIT in case of initialization error
      *         INVALID_OPERATION if called out of sequence
      */
-    virtual status_t start(const AudioClient& client, audio_port_handle_t *handle) = 0;
+    virtual status_t start(const AudioClient& client,
+                           const audio_attributes_t *attr,
+                           audio_port_handle_t *handle) = 0;
 
     /**
      * Stop a stream operating in mmap mode.