diff --git a/src/memline.c b/src/memline.c
index 451ace3..b876261 100644
--- a/src/memline.c
+++ b/src/memline.c
@@ -43,7 +43,7 @@
  */
 
 #if defined(MSDOS) || defined(WIN32) || defined(_WIN64)
-# include <io.h>
+# include "vimio.h"
 #endif
 
 #include "vim.h"