diff --git a/tests/zfs-tests/tests/functional/acl/off/posixmode.ksh b/tests/zfs-tests/tests/functional/acl/off/posixmode.ksh
index df278ae2366c..2028265e0891 100755
--- a/tests/zfs-tests/tests/functional/acl/off/posixmode.ksh
+++ b/tests/zfs-tests/tests/functional/acl/off/posixmode.ksh
@@ -130,7 +130,7 @@ function test_posix_mode # base
 }
 
 # Sanity check on tmpfs first
-tmpdir=$(TMPDIR=$TEST_BASE_DIR mktemp -d)
+tmpdir=$(mktemp -d)
 log_must mount -t tmpfs tmp $tmpdir
 log_must chmod 777 $tmpdir
 
diff --git a/tests/zfs-tests/tests/functional/arc/dbufstats_001_pos.ksh b/tests/zfs-tests/tests/functional/arc/dbufstats_001_pos.ksh
index 552a27e98102..977d9048e5b1 100755
--- a/tests/zfs-tests/tests/functional/arc/dbufstats_001_pos.ksh
+++ b/tests/zfs-tests/tests/functional/arc/dbufstats_001_pos.ksh
@@ -40,8 +40,8 @@
 #    dbufstat and the dbufs kstat output
 #
 
-DBUFSTATS_FILE=$(mktemp $TEST_BASE_DIR/dbufstats.out.XXXXXX)
-DBUFS_FILE=$(mktemp $TEST_BASE_DIR/dbufs.out.XXXXXX)
+DBUFSTATS_FILE=$(mktemp -t dbufstats.out.XXXXXX)
+DBUFS_FILE=$(mktemp -t dbufs.out.XXXXXX)
 
 function cleanup
 {
diff --git a/tests/zfs-tests/tests/functional/arc/dbufstats_002_pos.ksh b/tests/zfs-tests/tests/functional/arc/dbufstats_002_pos.ksh
index 2908895d0c6a..3db22443bdfa 100755
--- a/tests/zfs-tests/tests/functional/arc/dbufstats_002_pos.ksh
+++ b/tests/zfs-tests/tests/functional/arc/dbufstats_002_pos.ksh
@@ -42,7 +42,7 @@
 # 8. Ensure that at least some dbufs moved to the mfu list in the ARC
 #
 
-DBUFS_FILE=$(mktemp $TEST_BASE_DIR/dbufs.out.XXXXXX)
+DBUFS_FILE=$(mktemp -t dbufs.out.XXXXXX)
 
 function cleanup
 {
diff --git a/tests/zfs-tests/tests/functional/cli_root/zfs_send/zfs_send_007_pos.ksh b/tests/zfs-tests/tests/functional/cli_root/zfs_send/zfs_send_007_pos.ksh
index 15760398127c..3a0382867de6 100755
--- a/tests/zfs-tests/tests/functional/cli_root/zfs_send/zfs_send_007_pos.ksh
+++ b/tests/zfs-tests/tests/functional/cli_root/zfs_send/zfs_send_007_pos.ksh
@@ -48,8 +48,8 @@ function cleanup
 
 log_assert "Verify that 'zfs send' drills appropriate holes"
 log_onexit cleanup
-streamfile=$(mktemp $TESTDIR/file.XXXXXX)
-vdev=$(mktemp $TEST_BASE_DIR/file.XXXXXX)
+streamfile=$(mktemp)
+vdev=$(mktemp)
 
 
 function test_pool
diff --git a/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import_rename_001_pos.ksh b/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import_rename_001_pos.ksh
index 4d6005d2cb02..ec794782375d 100755
--- a/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import_rename_001_pos.ksh
+++ b/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import_rename_001_pos.ksh
@@ -160,7 +160,7 @@ while (( i < ${#pools[*]} )); do
 	((i = i + 1))
 done
 
-VDEV_FILE=$(mktemp $TEST_BASE_DIR/tmp.XXXXXX)
+VDEV_FILE=$(mktemp)
 
 log_must mkfile -n 128M $VDEV_FILE
 log_must zpool create overflow $VDEV_FILE
diff --git a/tests/zfs-tests/tests/functional/redacted_send/redacted_panic.ksh b/tests/zfs-tests/tests/functional/redacted_send/redacted_panic.ksh
index a2438c2cd731..7e4f3f081477 100755
--- a/tests/zfs-tests/tests/functional/redacted_send/redacted_panic.ksh
+++ b/tests/zfs-tests/tests/functional/redacted_send/redacted_panic.ksh
@@ -28,7 +28,7 @@ typeset ds_name="panic"
 typeset sendfs="$POOL/$ds_name"
 typeset recvfs="$POOL2/$ds_name"
 typeset clone="$POOL/${ds_name}_clone"
-typeset stream=$(mktemp $TEST_BASE_DIR/stream.XXXX)
+typeset stream=$(mktemp -t stream.XXXX)
 
 function cleanup
 {
diff --git a/tests/zfs-tests/tests/functional/snapshot/snapshot_002_pos.ksh b/tests/zfs-tests/tests/functional/snapshot/snapshot_002_pos.ksh
index d9e44d332e05..4c78e3ab2ee9 100755
--- a/tests/zfs-tests/tests/functional/snapshot/snapshot_002_pos.ksh
+++ b/tests/zfs-tests/tests/functional/snapshot/snapshot_002_pos.ksh
@@ -63,7 +63,7 @@ function cleanup
 log_assert "Verify an archive of a file system is identical to " \
     "an archive of its snapshot."
 
-SNAPSHOT_TARDIR="$(mktemp -d /tmp/zfstests_snapshot_002.XXXXXX)"
+SNAPSHOT_TARDIR="$(mktemp -t -d zfstests_snapshot_002.XXXXXX)"
 log_onexit cleanup
 
 typeset -i COUNT=21
diff --git a/tests/zfs-tests/tests/functional/snapshot/snapshot_006_pos.ksh b/tests/zfs-tests/tests/functional/snapshot/snapshot_006_pos.ksh
index e34a50941470..392869bf83ad 100755
--- a/tests/zfs-tests/tests/functional/snapshot/snapshot_006_pos.ksh
+++ b/tests/zfs-tests/tests/functional/snapshot/snapshot_006_pos.ksh
@@ -72,7 +72,7 @@ function cleanup
 log_assert "Verify that an archive of a dataset is identical to " \
    "an archive of the dataset's snapshot."
 
-SNAPSHOT_TARDIR="$(mktemp -d /tmp/zfstests_snapshot_006.XXXXXX)"
+SNAPSHOT_TARDIR="$(mktemp -t -d zfstests_snapshot_006.XXXXXX)"
 log_onexit cleanup
 
 typeset -i COUNT=21
diff --git a/tests/zfs-tests/tests/functional/user_namespace/user_namespace_004.ksh b/tests/zfs-tests/tests/functional/user_namespace/user_namespace_004.ksh
index e6ad25f23f93..4f6ed775ecab 100755
--- a/tests/zfs-tests/tests/functional/user_namespace/user_namespace_004.ksh
+++ b/tests/zfs-tests/tests/functional/user_namespace/user_namespace_004.ksh
@@ -58,7 +58,7 @@ log_onexit user_ns_cleanup
 log_must zfs create -o zoned=on "$TESTPOOL/userns"
 
 # 1. Try to pass a non-namespace file to zfs zone.
-temp_file="$(TMPDIR=$TEST_BASE_DIR mktemp)"
+temp_file="$(mktemp)"
 log_mustnot zfs zone "$temp_file" "$TESTPOOL/userns"
 
 # 2. Try to pass a non-namespace and non-existent file to zfs zone.
diff --git a/tests/zfs-tests/tests/functional/zvol/zvol_misc/zvol_misc_fua.ksh b/tests/zfs-tests/tests/functional/zvol/zvol_misc/zvol_misc_fua.ksh
index 9ebd5b149118..8b10813c9f1a 100755
--- a/tests/zfs-tests/tests/functional/zvol/zvol_misc/zvol_misc_fua.ksh
+++ b/tests/zfs-tests/tests/functional/zvol/zvol_misc/zvol_misc_fua.ksh
@@ -47,8 +47,8 @@ if ! is_linux ; then
 	log_unsupported "Only linux supports dd with oflag=dsync for FUA writes"
 fi
 
-typeset datafile1="$(mktemp zvol_misc_fua1.XXXXXX)"
-typeset datafile2="$(mktemp zvol_misc_fua2.XXXXXX)"
+typeset datafile1="$(mktemp -t zvol_misc_fua1.XXXXXX)"
+typeset datafile2="$(mktemp -t zvol_misc_fua2.XXXXXX)"
 typeset zvolpath=${ZVOL_DEVDIR}/$TESTPOOL/$TESTVOL
 
 function cleanup
diff --git a/tests/zfs-tests/tests/functional/zvol/zvol_misc/zvol_misc_trim.ksh b/tests/zfs-tests/tests/functional/zvol/zvol_misc/zvol_misc_trim.ksh
index 47cc42b9be7d..329757cce770 100755
--- a/tests/zfs-tests/tests/functional/zvol/zvol_misc/zvol_misc_trim.ksh
+++ b/tests/zfs-tests/tests/functional/zvol/zvol_misc/zvol_misc_trim.ksh
@@ -65,8 +65,8 @@ if ! is_physical_device $DISKS; then
 	log_unsupported "This directory cannot be run on raw files."
 fi
 
-typeset datafile1="$(mktemp zvol_misc_flags1.XXXXXX)"
-typeset datafile2="$(mktemp zvol_misc_flags2.XXXXXX)"
+typeset datafile1="$(mktemp -t zvol_misc_flags1.XXXXXX)"
+typeset datafile2="$(mktemp -t zvol_misc_flags2.XXXXXX)"
 typeset zvolpath=${ZVOL_DEVDIR}/$TESTPOOL/$TESTVOL
 
 function cleanup
diff --git a/tests/zfs-tests/tests/functional/zvol/zvol_stress/zvol_stress.ksh b/tests/zfs-tests/tests/functional/zvol/zvol_stress/zvol_stress.ksh
index 3431d33d97d0..8d580911dea8 100755
--- a/tests/zfs-tests/tests/functional/zvol/zvol_stress/zvol_stress.ksh
+++ b/tests/zfs-tests/tests/functional/zvol/zvol_stress/zvol_stress.ksh
@@ -57,7 +57,7 @@ biggest_zvol_size_possible=$(largest_volsize_from_pool $TESTPOOL)
 typeset -f each_zvol_size=$(( floor($biggest_zvol_size_possible * 0.9 / \
 	$num_zvols )))
 
-typeset tmpdir="$(mktemp -d zvol_stress_fio_state.XXXXXX)"
+typeset tmpdir="$(mktemp -t -d zvol_stress_fio_state.XXXXXX)"
 
 function create_zvols
 {