diff --git a/include/nuttx/audio/audio.h b/include/nuttx/audio/audio.h
index 9504e5d3be3..74c33211e5c 100644
--- a/include/nuttx/audio/audio.h
+++ b/include/nuttx/audio/audio.h
@@ -484,7 +484,7 @@ struct audio_buf_desc_s
 #ifdef CONFIG_AUDIO_MULTI_SESSION
   FAR void            *session;           /* Associated channel */
 #endif
-  uint16_t            numbytes;           /* Number of bytes to allocate */
+  apb_samp_t          numbytes;           /* Number of bytes to allocate */
   union
   {
     FAR struct ap_buffer_s  *buffer;     /* Buffer to free / enqueue */