diff --git a/src/os_mswin.c b/src/os_mswin.c
index 998d27b..3d8a084 100644
--- a/src/os_mswin.c
+++ b/src/os_mswin.c
@@ -22,7 +22,7 @@
 # endif
 #endif
 
-#include <io.h>
+#include "vimio.h"
 #include "vim.h"
 
 #ifdef HAVE_FCNTL_H