diff --git a/lib/mes/ntoab.c b/lib/mes/ntoab.c
index e75108ba..98e81072 100644
--- a/lib/mes/ntoab.c
+++ b/lib/mes/ntoab.c
@@ -1,6 +1,6 @@
 /* -*-comment-start: "//";comment-end:""-*-
  * GNU Mes --- Maxwell Equations of Software
- * Copyright © 2016,2017,2018,2019,2020 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+ * Copyright © 2016,2017,2018,2019,2020,2022 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
  *
  * This file is part of GNU Mes.
  *
@@ -23,7 +23,7 @@
 #include <stdlib.h>
 #include <string.h>
 
-#if __M2_PLANET__ || !(__MESC__ && __arm__)
+#if __M2_PLANET__ || (!(__MESC__ && __arm__) && !(__TINYC__ && __arm__ && BOOTSTRAP))
 size_t
 __mesabi_uldiv (size_t a, size_t b, size_t *remainder)
 {