diff --git a/bin/helpers b/bin/helpers
index 6c9a1722c..13f04fd4d 100644
--- a/bin/helpers
+++ b/bin/helpers
@@ -173,6 +173,16 @@ createCertificateAndKey() (
   openssl req -x509 -newkey ec -pkeyopt ec_paramgen_curve:secp384r1 -sha384 -keyout "${key_file}" -nodes -out "${crt_file}" -days 1 -subj "/CN=${cn}"
 )
 
+# certificateFingerprint: returns the certificate's fingerprint.
+certificateFingerprint() (
+  openssl x509 -in "${1}" -outform der | sha256sum
+)
+
+# certificateFingerprintShort: returns the certificate's fingerprint in short form as used by LXD.
+certificateFingerprintShort() (
+  certificateFingerprint "${1}" | head -c12
+)
+
 # cleanup: report if the test passed or not and return the appropriate return code.
 cleanup() {
     set +e
diff --git a/tests/cluster b/tests/cluster
index a9dded770..de2ce2c34 100755
--- a/tests/cluster
+++ b/tests/cluster
@@ -97,8 +97,8 @@ createCertificateAndKey "${tmp_cert_dir}/cert.key" "${tmp_cert_dir}/cert.crt" "c
 createCertificateAndKey "${tmp_cert_dir}/cert-restricted.key" "${tmp_cert_dir}/cert-restricted.crt" "cert-restricted.local"
 lxc config trust add "${tmp_cert_dir}/cert.crt"
 lxc config trust add "${tmp_cert_dir}/cert-restricted.crt" --restricted --projects default
-unrestricted_fingerprint="$(openssl x509 -in "${tmp_cert_dir}/cert.crt" -outform der | sha256sum | head -c12)"
-restricted_fingerprint="$(openssl x509 -in "${tmp_cert_dir}/cert-restricted.crt" -outform der | sha256sum | head -c12)"
+unrestricted_fingerprint="$(certificateFingerprintShort "${tmp_cert_dir}/cert.crt")"
+restricted_fingerprint="$(certificateFingerprintShort "${tmp_cert_dir}/cert-restricted.crt")"
 
 echo "==> Check the certificates for its permissions"
 lxc query "/1.0/certificates/${unrestricted_fingerprint}" | jq -r ".restricted" | grep -xF false
@@ -112,8 +112,8 @@ createCertificateAndKey "${tmp_cert_dir}/metrics.key" "${tmp_cert_dir}/metrics.c
 createCertificateAndKey "${tmp_cert_dir}/metrics-restricted.key" "${tmp_cert_dir}/metrics-restricted.crt" "metrics-restricted.local"
 lxc config trust add "${tmp_cert_dir}/metrics.crt" --type metrics
 lxc config trust add "${tmp_cert_dir}/metrics-restricted.crt" --type metrics --restricted --projects default
-unrestricted_metrics_fingerprint="$(openssl x509 -in "${tmp_cert_dir}/metrics.crt" -outform der | sha256sum | head -c12)"
-restricted_metrics_fingerprint="$(openssl x509 -in "${tmp_cert_dir}/metrics-restricted.crt" -outform der | sha256sum | head -c12)"
+unrestricted_metrics_fingerprint="$(certificateFingerprintShort "${tmp_cert_dir}/metrics.crt")"
+restricted_metrics_fingerprint="$(certificateFingerprintShort "${tmp_cert_dir}/metrics-restricted.crt")"
 
 echo "==> Check the metrics certificates for its permissions"
 lxc query "/1.0/certificates/${unrestricted_metrics_fingerprint}" | jq -r ".restricted" | grep -xF false