diff --git a/src/misc.h b/src/misc.h
index 2a3172b5..c358dde9 100644
--- a/src/misc.h
+++ b/src/misc.h
@@ -10,6 +10,11 @@
 #include <time.h>
 #include <pthread.h>
 
+/* Samples to bytes, bytes to samples */
+#define STOB(s) ((s) * 4)
+#define BTOS(b) ((b) / 4)
+
+
 struct onekeyval {
   char *name;
   char *value;
diff --git a/src/outputs/alsa.c b/src/outputs/alsa.c
index 9e54c158..20a902c4 100644
--- a/src/outputs/alsa.c
+++ b/src/outputs/alsa.c
@@ -32,6 +32,7 @@
 #include <event2/event.h>
 #include <asoundlib.h>
 
+#include "misc.h"
 #include "conffile.h"
 #include "logger.h"
 #include "player.h"
diff --git a/src/outputs/fifo.c b/src/outputs/fifo.c
index 9199d276..dd44ceb8 100644
--- a/src/outputs/fifo.c
+++ b/src/outputs/fifo.c
@@ -33,6 +33,7 @@
 
 #include <event2/event.h>
 
+#include "misc.h"
 #include "conffile.h"
 #include "logger.h"
 #include "player.h"