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diff --git a/test-suite/standalone/test-foreign-object-c.c b/test-suite/standalone/test-foreign-object-c.c
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+/* test-foreign-object-c.c - exercise C foreign object interface */
+
+/* Copyright 2014,2018
+ Free Software Foundation, Inc.
+
+ This file is part of Guile.
+
+ Guile 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.
+
+ Guile 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 Guile. If not, see
+ <https://www.gnu.org/licenses/>. */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <libguile.h>
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+enum
+ {
+ CSTR_SLOT_ADDR,
+ CSTR_SLOT_LEN,
+ CSTR_SLOT_COUNT
+ };
+
+static void
+finalizer (SCM obj)
+{
+ free (scm_foreign_object_ref (obj, CSTR_SLOT_ADDR));
+}
+
+static SCM
+make_cstr_from_static (SCM type, const char *str)
+{
+ char *ours = strdup (str);
+
+ if (!ours)
+ abort ();
+
+ return scm_make_foreign_object_2 (type, ours, (void *) strlen (ours));
+}
+
+static int
+cstr_equals_static_p (SCM cstr, const char *str)
+{
+ const char *addr;
+ size_t len;
+
+ addr = scm_foreign_object_ref (cstr, CSTR_SLOT_ADDR);
+ len = scm_foreign_object_unsigned_ref (cstr, CSTR_SLOT_LEN);
+
+ if (strlen (str) != len)
+ return 0;
+
+ return strncmp (addr, str, len) == 0;
+}
+
+static void
+test_scm_foreign_object (void)
+{
+ SCM type_name, slot_names, type, cstr;
+
+ type_name = scm_from_utf8_symbol ("<cstr>");
+ slot_names = scm_list_2 (scm_from_utf8_symbol ("addr"),
+ scm_from_utf8_symbol ("len"));
+ type = scm_make_foreign_object_type (type_name, slot_names, finalizer);
+
+ cstr = make_cstr_from_static (type, "Hello, world!");
+ scm_assert_foreign_object_type (type, cstr);
+
+ if (!cstr_equals_static_p (cstr, "Hello, world!"))
+ {
+ fprintf (stderr, "fail: test-foreign-object 1\n");
+ exit (EXIT_FAILURE);
+ }
+
+ {
+ int i;
+ for (i = 0; i < 5000; i++)
+ cstr = make_cstr_from_static (type, "Hello, world!");
+ cstr = SCM_BOOL_F;
+ }
+
+ scm_gc ();
+ scm_gc ();
+ scm_gc ();
+
+ /* Allow time for the finalizer thread to run. */
+ scm_usleep (scm_from_uint (50 * 1000));
+}
+
+static void
+tests (void *data, int argc, char **argv)
+{
+ test_scm_foreign_object ();
+}
+
+int
+main (int argc, char *argv[])
+{
+ scm_boot_guile (argc, argv, tests, NULL);
+ return 0;
+}