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diff --git a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/cli_root/zfs_mount/zfs_mount_004_pos.ksh b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/cli_root/zfs_mount/zfs_mount_004_pos.ksh
new file mode 100755
index 000000000000..4874c6d6530a
--- /dev/null
+++ b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/cli_root/zfs_mount/zfs_mount_004_pos.ksh
@@ -0,0 +1,83 @@
+#!/bin/ksh -p
+#
+# CDDL HEADER START
+#
+# The contents of this file are subject to the terms of the
+# Common Development and Distribution License (the "License").
+# You may not use this file except in compliance with the License.
+#
+# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+# or http://www.opensolaris.org/os/licensing.
+# See the License for the specific language governing permissions
+# and limitations under the License.
+#
+# When distributing Covered Code, include this CDDL HEADER in each
+# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+# If applicable, add the following below this CDDL HEADER, with the
+# fields enclosed by brackets "[]" replaced with your own identifying
+# information: Portions Copyright [yyyy] [name of copyright owner]
+#
+# CDDL HEADER END
+#
+
+#
+# Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
+# Use is subject to license terms.
+#
+
+#
+# Copyright (c) 2016 by Delphix. All rights reserved.
+#
+
+. $STF_SUITE/include/libtest.shlib
+. $STF_SUITE/tests/functional/cli_root/zfs_mount/zfs_mount.kshlib
+
+#
+# DESCRIPTION:
+# Invoke "zfs mount <filesystem>" with a filesystem
+# which has been already mounted,
+# it will fail with a return code of 1
+#
+# STRATEGY:
+# 1. Make sure that the ZFS filesystem is unmounted.
+# 2. Invoke 'zfs mount <filesystem>'.
+# 3. Verify that the filesystem is mounted.
+# 4. Invoke 'zfs mount <filesystem>' the second times.
+# 5. Verify the last mount operation failed with return code of 1.
+#
+
+verify_runnable "both"
+
+function cleanup
+{
+	log_must force_unmount $TESTPOOL/$TESTFS
+	return 0
+}
+
+typeset -i ret=0
+
+log_assert "Verify that 'zfs $mountcmd <filesystem>' " \
+	"with a mounted filesystem will fail with return code 1."
+
+log_onexit cleanup
+
+unmounted $TESTPOOL/$TESTFS || \
+	log_must cleanup
+
+log_must zfs $mountcmd $TESTPOOL/$TESTFS
+
+mounted $TESTPOOL/$TESTFS || \
+	log_unresolved "Filesystem $TESTPOOL/$TESTFS is unmounted"
+
+zfs $mountcmd $TESTPOOL/$TESTFS
+ret=$?
+(( ret == 1 )) || \
+	log_fail "'zfs $mountcmd $TESTPOOL/$TESTFS' " \
+		"unexpected return code of $ret."
+
+log_note "Make sure the filesystem $TESTPOOL/$TESTFS is mounted"
+mounted $TESTPOOL/$TESTFS || \
+	log_fail Filesystem $TESTPOOL/$TESTFS is unmounted
+
+log_pass "'zfs $mountcmd <filesystem>' with a mounted filesystem " \
+	"will fail with return code 1."