diff --git a/include/nuttx/audio/audio.h b/include/nuttx/audio/audio.h
index 058bd71f6d..8ce2b0cb1d 100644
--- a/include/nuttx/audio/audio.h
+++ b/include/nuttx/audio/audio.h
@@ -160,6 +160,7 @@
 #define AUDIO_FMT_MSBC              0x0e
 #define AUDIO_FMT_CVSD              0x0f
 #define AUDIO_FMT_AMR               0x10
+#define AUDIO_FMT_OPUS              0x11
 
 /* Audio Sub-Format Types ***************************************************/