diff --git a/programs/develop/libraries/menuetlibc/src/libc/ansi/stdio/fprintf.c b/programs/develop/libraries/menuetlibc/src/libc/ansi/stdio/fprintf.c
index 7a099a9a71..7831a65e01 100755
--- a/programs/develop/libraries/menuetlibc/src/libc/ansi/stdio/fprintf.c
+++ b/programs/develop/libraries/menuetlibc/src/libc/ansi/stdio/fprintf.c
@@ -1,6 +1,7 @@
 /* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */
 #include <stdio.h>
 #include <libc/file.h>
+#include <stdarg.h>
 
 int
 fprintf(register FILE *iop, const char *fmt, ...)