diff --git a/c/src/lib/libbsp/i386/go32/console/outch.c b/c/src/lib/libbsp/i386/go32/console/outch.c
index fa4422e1b3..9f7df342db 100644
--- a/c/src/lib/libbsp/i386/go32/console/outch.c
+++ b/c/src/lib/libbsp/i386/go32/console/outch.c
@@ -6,6 +6,7 @@
 #include <bsp.h>
 
 #include <string.h>
+#include <unistd.h>
 
 #define	MAX_COL	80
 #define MAX_ROW	50