diff --git a/tests/stress_tests/extractloop.bash b/tests/stress_tests/extractloop.bash
index 742715d..c6e9632 100755
--- a/tests/stress_tests/extractloop.bash
+++ b/tests/stress_tests/extractloop.bash
@@ -11,6 +11,11 @@
 #
 # See Documentation/extractloop.md for example output.
 
+if [[ -z $TMPDIR ]]; then
+	TMPDIR=/var/tmp
+	export TMPDIR
+fi
+
 set -eu
 
 # Run at low priority to not annoy the user too much
@@ -23,8 +28,8 @@ source ../fuse-unmount.bash
 
 # Setup dirs
 ../dl-linux-tarball.bash
-cd /tmp
-EXTRACTLOOP_TMPDIR=/tmp/extractloop_tmpdir
+cd $TMPDIR
+EXTRACTLOOP_TMPDIR=$TMPDIR/extractloop_tmpdir
 mkdir -p $EXTRACTLOOP_TMPDIR
 CRYPT=$(mktemp -d $EXTRACTLOOP_TMPDIR/XXX)
 CSV=$CRYPT.csv
diff --git a/tests/stress_tests/fsstress-gocryptfs.bash b/tests/stress_tests/fsstress-gocryptfs.bash
index 2bb362f..78a7f7d 100755
--- a/tests/stress_tests/fsstress-gocryptfs.bash
+++ b/tests/stress_tests/fsstress-gocryptfs.bash
@@ -12,6 +12,11 @@
 #
 # Nowadays it should pass an indefinite number of iterations.
 
+if [[ -z $TMPDIR ]]; then
+	TMPDIR=/var/tmp
+	export TMPDIR
+fi
+
 set -eu
 
 cd "$(dirname "$0")"
@@ -28,7 +33,7 @@ then
 fi
 
 # Backing directory
-DIR=$(mktemp -d /tmp/$MYNAME.XXX)
+DIR=$(mktemp -d $TMPDIR/$MYNAME.XXX)
 # Mountpoint
 MNT="$DIR.mnt"
 mkdir $MNT
diff --git a/tests/stress_tests/parallel_cp.sh b/tests/stress_tests/parallel_cp.sh
index b9e6b4b..ad98e5e 100755
--- a/tests/stress_tests/parallel_cp.sh
+++ b/tests/stress_tests/parallel_cp.sh
@@ -12,6 +12,11 @@
 #
 # See https://github.com/rfjakob/gocryptfs/issues/322 for details.
 
+if [[ -z $TMPDIR ]]; then
+	TMPDIR=/var/tmp
+	export TMPDIR
+fi
+
 cd "$(dirname "$0")"
 MYNAME=$(basename $0)
 source ../fuse-unmount.bash
@@ -20,7 +25,7 @@ source ../fuse-unmount.bash
 GOPATH=$(go env GOPATH)
 
 # Backing directory
-DIR=$(mktemp -d /tmp/$MYNAME.XXX)
+DIR=$(mktemp -d $TMPDIR/$MYNAME.XXX)
 $GOPATH/bin/gocryptfs -q -init -extpass "echo test" -scryptn=10 $DIR
 
 # Mountpoint