diff --git a/src/proxmox-acme b/src/proxmox-acme
index a00d23a..637a405 100644
--- a/src/proxmox-acme
+++ b/src/proxmox-acme
@@ -696,6 +696,11 @@ _readaccountconf_mutable() {
   _readaccountconf "$1"
 }
 
+# key
+_readdomainconf() {
+  echo "${!1}"
+}
+
 # no-ops:
 _clearaccountconf() {
   return 0