diff --git a/src/partition/test-repart.sh b/src/partition/test-repart.sh
index 5765978290..9af3049b6b 100755
--- a/src/partition/test-repart.sh
+++ b/src/partition/test-repart.sh
@@ -6,7 +6,7 @@ set -ex
 repart=$1
 test -x $repart
 
-D=$(mktemp --directory)
+D=$(mktemp --tmpdir --directory "test-repart.XXXXXXXXXX")
 trap "rm -rf '$D'" EXIT INT QUIT PIPE
 mkdir -p $D/definitions
 
diff --git a/test/hwdb-test.sh b/test/hwdb-test.sh
index d12f82fa2d..8b909f7d80 100755
--- a/test/hwdb-test.sh
+++ b/test/hwdb-test.sh
@@ -18,7 +18,7 @@ if [ ! -x "$SYSTEMD_HWDB" ]; then
     exit 1
 fi
 
-D=$(mktemp --directory)
+D=$(mktemp --tmpdir --directory "hwdb-test.XXXXXXXXXX")
 trap "rm -rf '$D'" EXIT INT QUIT PIPE
 mkdir -p "$D/etc/udev"
 ln -s "$ROOTDIR/hwdb.d" "$D/etc/udev/hwdb.d"
diff --git a/test/test-network-generator-conversion.sh b/test/test-network-generator-conversion.sh
index d0d0834518..50df69f1b0 100755
--- a/test/test-network-generator-conversion.sh
+++ b/test/test-network-generator-conversion.sh
@@ -17,7 +17,7 @@ for f in "$src"/test-*.input; do
     echo "*** Running $f"
 
     (
-        out=$(mktemp --directory)
+        out=$(mktemp --tmpdir --directory "test-network-generator-conversion.XXXXXXXXXX")
         trap "rm -rf '$out'" EXIT INT QUIT PIPE
 
         $generator --root "$out" -- $(cat $f)