diff --git a/target/scripts/startup/setup-stack.sh b/target/scripts/startup/setup-stack.sh
index c3c54cc3..86870920 100644
--- a/target/scripts/startup/setup-stack.sh
+++ b/target/scripts/startup/setup-stack.sh
@@ -95,9 +95,11 @@ function _setup_apply_fixes_after_configuration() {
   _log 'debug' 'Removing files and directories from older versions'
   rm -rf /var/mail-state/spool-postfix/{dev,etc,lib,pid,usr,private/auth}
 
-  # /tmp/docker-mailserver/rspamd/dkim
-  _log 'debug' "Ensuring ${RSPAMD_DMS_DKIM_D} is owned by '_rspamd:_rspamd'"
-  chown -R _rspamd:_rspamd "${RSPAMD_DMS_DKIM_D}"
+  if [[ -n ${RSPAMD_DMS_DKIM_D} ]] ; then
+    # /tmp/docker-mailserver/rspamd/dkim
+    _log 'debug' "Ensuring ${RSPAMD_DMS_DKIM_D} is owned by '_rspamd:_rspamd'"
+    chown -R _rspamd:_rspamd "${RSPAMD_DMS_DKIM_D}"
+  fi
 }
 
 function _run_user_patches() {