diff --git a/src/memfile.c b/src/memfile.c
index bac84fe..aeeb8cb 100644
--- a/src/memfile.c
+++ b/src/memfile.c
@@ -33,7 +33,7 @@
  */
 
 #if defined MSDOS || defined(WIN32) || defined(_WIN64)
-# include <io.h>	/* for lseek(), must be before vim.h */
+# include "vimio.h"	/* for lseek(), must be before vim.h */
 #endif
 
 #include "vim.h"