diff --git a/sys/dev/sound/pcm/sound.h b/sys/dev/sound/pcm/sound.h
index 48ed90b68c2..999f62a76e5 100644
--- a/sys/dev/sound/pcm/sound.h
+++ b/sys/dev/sound/pcm/sound.h
@@ -68,6 +68,12 @@
 #include <vm/vm.h>
 #include <vm/pmap.h>
 
+#if __FreeBSD_version > 500000
+#define USING_MUTEX
+#define USING_DEVFS
+#define SND_DYNSYSCTL
+#endif
+
 #else
 struct isa_device { int dummy; };
 #define d_open_t void