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diff --git a/tests/zfs-tests/tests/functional/reservation/reservation_021_neg.ksh b/tests/zfs-tests/tests/functional/reservation/reservation_021_neg.ksh
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+++ b/tests/zfs-tests/tests/functional/reservation/reservation_021_neg.ksh
@@ -0,0 +1,72 @@
+#!/bin/ksh -p
+#
+# This file and its contents are supplied under the terms of the
+# Common Development and Distribution License ("CDDL"), version 1.0.
+# You may only use this file in accordance with the terms of version
+# 1.0 of the CDDL.
+#
+# A full copy of the text of the CDDL should have accompanied this
+# source.  A copy of the CDDL is also available via the Internet at
+# http://www.illumos.org/license/CDDL.
+#
+
+#
+# Copyright 2018 Joyent, Inc.
+#
+
+. $STF_SUITE/include/libtest.shlib
+. $STF_SUITE/tests/functional/reservation/reservation.shlib
+
+#
+# DESCRIPTION:
+#
+# The use of refreservation=auto on a filesystem does not change the
+# refreservation and results in an error.
+#
+# STRATEGY:
+# 1) Create a filesystem
+# 2) Verify that zfs set refreservation=auto fails without changing
+# refreservation from none.
+# 3) Set refreservation to a valid value.
+# 4) Verify that zfs set refreservation=auto fails without changing
+# refreservation from the previous value.
+#
+
+verify_runnable "both"
+
+fs=$TESTPOOL/$TESTFS/$(basename $0).$$
+
+function cleanup
+{
+	destroy_dataset "$fs" "-f"
+}
+
+log_onexit cleanup
+
+log_assert "refreservation=auto on a filesystem generates an error without" \
+	"changing refreservation"
+
+space_avail=$(get_prop available $TESTPOOL)
+(( fs_size = space_avail / 4 ))
+
+# Create a filesystem with no refreservation
+log_must zfs create $fs
+resv=$(get_prop refreservation $fs)
+log_must test $resv -eq 0
+
+# Verify that refreservation=auto fails without altering refreservation
+log_mustnot zfs set refreservation=auto $fs
+resv=$(get_prop refreservation $fs)
+log_must test $resv -eq 0
+
+# Set refreservation and verify
+log_must zfs set refreservation=$fs_size $fs
+resv=$(get_prop refreservation $fs)
+log_must test $resv -eq $fs_size
+
+# Verify that refreservation=auto fails without altering refreservation
+log_mustnot zfs set refreservation=auto $fs
+resv=$(get_prop refreservation $fs)
+log_must test $resv -eq $fs_size
+
+log_pass "refreservation=auto does not work on filesystems, as expected"