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diff --git a/src/test/ao_int64_test.c b/src/test/ao_int64_test.c
new file mode 100644
index 00000000..67ba6ec5
--- /dev/null
+++ b/src/test/ao_int64_test.c
@@ -0,0 +1,78 @@
+/*
+ * Copyright © 2013 Keith Packard <keithp@keithp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program 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
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+#include <ao_int64.h>
+#include <ao_int64.c>
+#include <stdio.h>
+#include <stdlib.h>
+
+int	errors;
+
+#define test(op,func,a,b,ao_a,ao_b) do {				\
+		r = (a) op (b);						\
+		func(&ao_r, ao_a, ao_b);				\
+		c = ao_cast64(&ao_r);					\
+		if (c != r) {						\
+			printf ("trial %4d: %lld " #func " %lld = %lld (should be %lld)\n", \
+				trial, (int64_t) (a), (int64_t) b, c, r); \
+			++errors;					\
+		}							\
+	} while (0)
+
+
+void
+do_test(int trial, int64_t a, int64_t b)
+{
+	int64_t	r, c;
+	ao_int64_t	ao_a, ao_b, ao_r;
+
+	ao_int64_init64(&ao_a, a >> 32, a);
+	ao_int64_init64(&ao_b, b >> 32, b);
+
+	test(+, ao_plus64, a, b, &ao_a, &ao_b);
+	test(*, ao_mul64,(int64_t) (int32_t) a, (int32_t) b, (int32_t) a, (int32_t) b);
+	test(>>, ao_rshift64, a, (uint8_t) b & 0x3f, &ao_a, (uint8_t) b & 0x3f);
+	test(<<, ao_lshift64, a, (uint8_t) b & 0x3f, &ao_a, (uint8_t) b & 0x3f);
+	test(*, ao_mul64_16, a, (uint16_t) b, &ao_a, (uint16_t) b);
+}
+
+#define TESTS	10000000
+
+static int64_t
+random64(void)
+{
+	return (int64_t) random() + ((int64_t) random() << 31) /* + ((int64_t) random() << 33) */;
+}
+
+int
+main (int argc, char **argv)
+{
+	int	i, start;
+
+	if (argv[1])
+		start = atoi(argv[1]);
+	else
+		start = 0;
+	srandom(1000);
+	for (i = 0; i < TESTS; i++) {
+		int64_t a = random64();
+		int64_t b = random64();
+		if (i >= start)
+			do_test(i, a, b);
+	}
+	return errors;
+}