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
@@ -335,10 +335,12 @@
 extern int report_soft_formats;
 extern int report_soft_matrix;
 
-#define PCMDIR_PLAY		1
-#define PCMDIR_PLAY_VIRTUAL	2
-#define PCMDIR_REC		-1
-#define PCMDIR_REC_VIRTUAL	-2
+enum {
+	PCMDIR_PLAY,
+	PCMDIR_PLAY_VIRTUAL,
+	PCMDIR_REC,
+	PCMDIR_REC_VIRTUAL,
+};
 
 #define PCMTRIG_START 1
 #define PCMTRIG_EMLDMAWR 2