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diff --git a/gmp/tests/t-hightomask.c b/gmp/tests/t-hightomask.c
new file mode 100644
index 00000000..9e6c109f
--- /dev/null
+++ b/gmp/tests/t-hightomask.c
@@ -0,0 +1,43 @@
+/* Test LIMB_HIGHBIT_TO_MASK.
+
+Copyright 2004 Free Software Foundation, Inc.
+
+This file is part of the GNU MP Library.
+
+The GNU MP Library is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 3 of the License, or (at your
+option) any later version.
+
+The GNU MP Library is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.  */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "gmp.h"
+#include "gmp-impl.h"
+#include "tests.h"
+
+
+/* There's very little to these tests, but it's nice to have them since if
+   something has gone wrong with the arithmetic right shift business in
+   LIMB_HIGHBIT_TO_MASK then the only symptom is likely to be failures in
+   udiv_qrnnd_preinv, which would not be easy to diagnose.  */
+
+int
+main (void)
+{
+  ASSERT_ALWAYS (LIMB_HIGHBIT_TO_MASK (0) == 0);
+  ASSERT_ALWAYS (LIMB_HIGHBIT_TO_MASK (GMP_LIMB_HIGHBIT) == MP_LIMB_T_MAX);
+  ASSERT_ALWAYS (LIMB_HIGHBIT_TO_MASK (MP_LIMB_T_MAX) == MP_LIMB_T_MAX);
+  ASSERT_ALWAYS (LIMB_HIGHBIT_TO_MASK (GMP_LIMB_HIGHBIT >> 1) == 0);
+  ASSERT_ALWAYS (LIMB_HIGHBIT_TO_MASK (MP_LIMB_T_MAX >> 1) == 0);
+
+  exit (0);
+}