diff --git a/test/units/testsuite-70.pcrlock.sh b/test/units/testsuite-70.pcrlock.sh
index 3da992613b2..cd031b4ed62 100755
--- a/test/units/testsuite-70.pcrlock.sh
+++ b/test/units/testsuite-70.pcrlock.sh
@@ -118,7 +118,20 @@ echo -n test70-take-two | "$SD_PCRLOCK" lock-raw --pcrlock=/var/lib/pcrlock.d/92
 systemd-cryptsetup attach pcrlock "$img" - tpm2-device=auto,tpm2-pcrlock=/var/lib/systemd/pcrlock.json,headless
 systemd-cryptsetup detach pcrlock
 
-"$SD_PCRLOCK" remove-policy
+# Now use the root fs support, i.e. make the tool write a copy of the pcrlock
+# file as service credential to some temporary dir and remove the local copy, so that
+# it has to use the credential version.
+mkdir /tmp/fakexbootldr
+SYSTEMD_XBOOTLDR_PATH=/tmp/fakexbootldr SYSTEMD_RELAX_XBOOTLDR_CHECKS=1 "$SD_PCRLOCK" make-policy --pcr="$PCRS" --force
+mv /var/lib/systemd/pcrlock.json /var/lib/systemd/pcrlock.json.gone
+
+systemd-creds decrypt /tmp/fakexbootldr/loader/credentials/pcrlock.*.cred
+
+SYSTEMD_ENCRYPTED_SYSTEM_CREDENTIALS_DIRECTORY=/tmp/fakexbootldr/loader/credentials systemd-cryptsetup attach pcrlock "$img" - tpm2-device=auto,headless
+systemd-cryptsetup detach pcrlock
+
+mv /var/lib/systemd/pcrlock.json.gone /var/lib/systemd/pcrlock.json
+SYSTEMD_XBOOTLDR_PATH=/tmp/fakexbootldr SYSTEMD_RELAX_XBOOTLDR_CHECKS=1 "$SD_PCRLOCK" remove-policy
 
 "$SD_PCRLOCK" unlock-firmware-config
 "$SD_PCRLOCK" unlock-gpt