diff --git a/regress/unittests/Makefile b/regress/unittests/Makefile
index e70b16644..e975f6ca4 100644
--- a/regress/unittests/Makefile
+++ b/regress/unittests/Makefile
@@ -1,5 +1,6 @@
-#	$OpenBSD: Makefile,v 1.7 2016/08/19 06:44:13 djm Exp $
-REGRESS_FAIL_EARLY= yes
-SUBDIR=	test_helper sshbuf sshkey bitmap kex hostkeys utf8 match
+#	$OpenBSD: Makefile,v 1.9 2017/03/14 01:20:29 dtucker Exp $
+
+REGRESS_FAIL_EARLY?=	yes
+SUBDIR=	test_helper sshbuf sshkey bitmap kex hostkeys utf8 match conversion
 
 .include <bsd.subdir.mk>
diff --git a/regress/unittests/conversion/Makefile b/regress/unittests/conversion/Makefile
new file mode 100644
index 000000000..cde97dc28
--- /dev/null
+++ b/regress/unittests/conversion/Makefile
@@ -0,0 +1,10 @@
+#	$OpenBSD: Makefile,v 1.1 2017/03/14 01:20:29 dtucker Exp $
+
+PROG=test_conversion
+SRCS=tests.c
+REGRESS_TARGETS=run-regress-${PROG}
+
+run-regress-${PROG}: ${PROG}
+	env ${TEST_ENV} ./${PROG}
+
+.include <bsd.regress.mk>
diff --git a/regress/unittests/conversion/tests.c b/regress/unittests/conversion/tests.c
new file mode 100644
index 000000000..ebd7bde00
--- /dev/null
+++ b/regress/unittests/conversion/tests.c
@@ -0,0 +1,47 @@
+/* 	$OpenBSD: tests.c,v 1.1 2017/03/14 01:20:29 dtucker Exp $ */
+/*
+ * Regress test for conversions
+ *
+ * Placed in the public domain
+ */
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "test_helper.h"
+
+#include "misc.h"
+
+void
+tests(void)
+{
+	char buf[1024];
+
+	TEST_START("conversion_convtime");
+	ASSERT_LONG_EQ(convtime("0"), 0);
+	ASSERT_LONG_EQ(convtime("1"), 1);
+	ASSERT_LONG_EQ(convtime("1S"), 1);
+	/* from the examples in the comment above the function */
+	ASSERT_LONG_EQ(convtime("90m"), 5400);
+	ASSERT_LONG_EQ(convtime("1h30m"), 5400);
+	ASSERT_LONG_EQ(convtime("2d"), 172800);
+	ASSERT_LONG_EQ(convtime("1w"), 604800);
+
+	/* negative time is not allowed */
+	ASSERT_LONG_EQ(convtime("-7"), -1);
+	ASSERT_LONG_EQ(convtime("-9d"), -1);
+	
+	/* overflow */
+	snprintf(buf, sizeof buf, "%llu", (unsigned long long)LONG_MAX + 1);
+	ASSERT_LONG_EQ(convtime(buf), -1);
+
+	/* overflow with multiplier */
+	snprintf(buf, sizeof buf, "%lluM", (unsigned long long)LONG_MAX/60 + 1);
+	ASSERT_LONG_EQ(convtime(buf), -1);
+	ASSERT_LONG_EQ(convtime("1000000000000000000000w"), -1);
+	TEST_DONE();
+}