diff --git a/mock/integration-tests/22-rootdir.tst b/mock/integration-tests/22-rootdir.tst
index 6a319d544..0bc983710 100644
--- a/mock/integration-tests/22-rootdir.tst
+++ b/mock/integration-tests/22-rootdir.tst
@@ -7,14 +7,17 @@ fi
 . "${TESTDIR}/functions"
 set -e
 
-TMPDIR=$(mktemp -d)
-cleanup() { rm -rf "$TMPDIR"; }
+# creating special files (e.g. /dev/null doesn't work below tmpfs)
+WORKDIR=$(mktemp -d -p "$HOME")
+
+cleanup() { rm -rf "$WORKDIR"; }
 trap cleanup EXIT
 
 header "mock with --rootdir option"
 
 for isolation in simple nspawn; do
-    runcmd "$MOCKCMD --isolation=$isolation --rootdir=$TMPDIR --scrub=chroot"
-    runcmd "$MOCKCMD --isolation=$isolation --rootdir=$TMPDIR --scrub=bootstrap"
-    runcmd "$MOCKCMD --isolation=$isolation --rootdir=$TMPDIR --bootstrap-chroot ${TESTDIR}/test-C-1.1-0.src.rpm"
+    rootdir=$WORKDIR/$isolation
+    runcmd "$MOCKCMD --isolation=$isolation --rootdir=$rootdir --scrub=chroot"
+    runcmd "$MOCKCMD --isolation=$isolation --rootdir=$rootdir --scrub=bootstrap"
+    runcmd "$MOCKCMD --isolation=$isolation --rootdir=$rootdir --bootstrap-chroot ${TESTDIR}/test-C-1.1-0.src.rpm"
 done