diff --git a/.docker/cert.sh b/.docker/cert.sh
index 6113ff525fcf5cf79224d1f0837d62c407b049bb..ef4119088ec6478948d116db10f14dcc44bba767 100755
--- a/.docker/cert.sh
+++ b/.docker/cert.sh
@@ -52,7 +52,7 @@ function cert() {
          -out caosdb.cert.pem -passin env:KEYPW \
          -subj "/C=/ST=/L=/O=example/OU=example/CN=${CAOSHOSTNAME}" \
          -days 365 \
-         -addext "subjectAltName = DNS:foo.co.uk" \
+         -addext "subjectAltName = DNS:${CAOSHOSTNAME}" \
          -addext "certificatePolicies = 1.2.3.4"
     KEYPW="${KEYPW}" KEYSTOREPW="$KEYSTOREPW" openssl pkcs12 -export \
          -inkey caosdb.key.pem -in caosdb.cert.pem -out all-certs.pkcs12 \