diff --git a/libavformat/os_support.c b/libavformat/os_support.c
index 5a8bb9ecd1e7090b9af46e64a538674bc4253c58..e28a7bc748a3517be8b811b1746e13660e0a2671 100644
--- a/libavformat/os_support.c
+++ b/libavformat/os_support.c
@@ -21,10 +21,8 @@
  */
 #include "config.h"
 #include "avformat.h"
-#if !defined(__MINGW32__)
 #include <unistd.h>
 #include <fcntl.h>
-#endif
 
 #ifndef HAVE_SYS_POLL_H
 #if defined(__MINGW32__)