diff --git a/sys/dev/sound/pcm/channel.h b/sys/dev/sound/pcm/channel.h
--- a/sys/dev/sound/pcm/channel.h
+++ b/sys/dev/sound/pcm/channel.h
@@ -362,7 +362,7 @@
 #define CHN_F_BUSY              0x00000100  /* has been opened 	*/
 #define CHN_F_DIRTY		0x00000200  /* need re-config */
 #define CHN_F_DEAD		0x00000400  /* too many errors, dead, mdk */
-#define CHN_F_SILENCE		0x00000800  /* silence, nil, null, yada */
+/* unused			0x00000800 */
 
 #define	CHN_F_HAS_SIZE		0x00001000  /* user set block size */
 #define CHN_F_HAS_VCHAN		0x00002000  /* vchan master */
@@ -388,7 +388,7 @@
 				"\011BUSY"				\
 				"\012DIRTY"				\
 				"\013DEAD"				\
-				"\014SILENCE"				\
+				/* \014 */				\
 				"\015HAS_SIZE"				\
 				"\016HAS_VCHAN"				\
 				"\017VCHAN_PASSTHROUGH"			\