diff --git a/src/main.c b/src/main.c
index 53d1848..587081b 100644
--- a/src/main.c
+++ b/src/main.c
@@ -7,7 +7,7 @@
  * See README.txt for an overview of the Vim source code.
  */
 
-#if defined(MSDOS) || defined(WIN32) || defined(_WIN64)
+#if defined(MSDOS) || defined(WIN16) || defined(WIN32) || defined(_WIN64)
 # include "vimio.h"		/* for close() and dup() */
 #endif