diff --git a/lib/fileio.c b/lib/fileio.c
index 78e25ab1..00a9137f 100644
--- a/lib/fileio.c
+++ b/lib/fileio.c
@@ -4,7 +4,7 @@
 #include <stddef.h>
 #include <sys/stat.h>
 #if defined(_MSC_VER)
-#include <windows.h>
+#include <io.h>
 #define open _open
 #define O_RDONLY _O_RDONLY
 #define O_BINARY _O_BINARY