diff --git a/ffserver.c b/ffserver.c
index 4f072286c6..c240c48907 100644
--- a/ffserver.c
+++ b/ffserver.c
@@ -28,6 +28,7 @@
 #include "avformat.h"
 #include "rtsp.h"
 #include "rtp.h"
+#include "os_support.h"
 
 #include <stdarg.h>
 #include <unistd.h>
diff --git a/libavformat/rtpproto.c b/libavformat/rtpproto.c
index 870273f8cc..d1d5a92477 100644
--- a/libavformat/rtpproto.c
+++ b/libavformat/rtpproto.c
@@ -24,6 +24,7 @@
 #include <unistd.h>
 #include <stdarg.h>
 #include "network.h"
+#include "os_support.h"
 #include <fcntl.h>
 
 #define RTP_TX_BUF_SIZE  (64 * 1024)