diff --git a/libavformat/network.h b/libavformat/network.h
index bd30368137..7af77991d4 100644
--- a/libavformat/network.h
+++ b/libavformat/network.h
@@ -21,6 +21,8 @@
 #ifndef AVFORMAT_NETWORK_H
 #define AVFORMAT_NETWORK_H
 
+#include "config.h"
+
 #if HAVE_WINSOCK2_H
 #include <winsock2.h>
 #include <ws2tcpip.h>
diff --git a/libavformat/os_support.h b/libavformat/os_support.h
index 165dc23a06..2425b988c6 100644
--- a/libavformat/os_support.h
+++ b/libavformat/os_support.h
@@ -27,6 +27,8 @@
  * miscellaneous OS support macros and functions.
  */
 
+#include "config.h"
+
 #ifdef __MINGW32__
 #  include <fcntl.h>
 #  define lseek(f,p,w) _lseeki64((f), (p), (w))