diff --git a/libao2/ao_macosx.c b/libao2/ao_macosx.c
index b53773ecd1..39813528ee 100644
--- a/libao2/ao_macosx.c
+++ b/libao2/ao_macosx.c
@@ -46,6 +46,7 @@
 #include <inttypes.h>
 #include <pthread.h>
 #include <sys/types.h>
+#include <sys/time.h>
 #include <unistd.h>
 
 #include "config.h"