diff --git a/include/nuttx/audio/audio.h b/include/nuttx/audio/audio.h
index 225b7f9a09..1053d8b9ff 100644
--- a/include/nuttx/audio/audio.h
+++ b/include/nuttx/audio/audio.h
@@ -158,6 +158,7 @@
 #define AUDIO_FMT_AAC               0x0d
 #define AUDIO_FMT_MSBC              0x0e
 #define AUDIO_FMT_CVSD              0x0f
+#define AUDIO_FMT_AMR               0x10
 
 /* Audio Sub-Format Types ***************************************************/