diff --git a/include/system/audio.h b/include/system/audio.h
index 9a25cfb..2bd99fa 100644
--- a/include/system/audio.h
+++ b/include/system/audio.h
@@ -133,6 +133,7 @@
                                           /* An example of remote presentation is Wifi Display */
                                           /*  where a dongle attached to a TV can be used to   */
                                           /*  play the mix captured by this audio source.      */
+    AUDIO_SOURCE_FM_TUNER            = 9,
     AUDIO_SOURCE_CNT,
     AUDIO_SOURCE_MAX                 = AUDIO_SOURCE_CNT - 1,
     AUDIO_SOURCE_HOTWORD             = 1999, /* A low-priority, preemptible audio source for