diff --git a/libmpdemux/muxer.c b/libmpdemux/muxer.c
index 877be8ae53..772bd5b12d 100644
--- a/libmpdemux/muxer.c
+++ b/libmpdemux/muxer.c
@@ -3,6 +3,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <inttypes.h>
+#include <unistd.h>
 
 #include "config.h"
 #include "../version.h"
diff --git a/libmpdemux/muxer_avi.c b/libmpdemux/muxer_avi.c
index 6aaeb044ff..4f8597f3a4 100644
--- a/libmpdemux/muxer_avi.c
+++ b/libmpdemux/muxer_avi.c
@@ -3,6 +3,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <inttypes.h>
+#include <unistd.h>
 
 #include "config.h"
 #include "../version.h"