diff --git a/roles/aten_pdu/files/aten-mqtt-publish.sh b/roles/aten_pdu/files/aten-mqtt-publish.sh
index 13432a0..ba81c93 100644
--- a/roles/aten_pdu/files/aten-mqtt-publish.sh
+++ b/roles/aten_pdu/files/aten-mqtt-publish.sh
@@ -62,7 +62,8 @@ do
                 continue
                 ;;
         esac
-        if device_name="$(ldapsearch -Q -LLL cn="${device}.*" cn | awk "
+	if device_name="$(ldapsearch -Q -LLL \
+            "(&(objectClass=device)(cn=${device}.*))" cn | awk "
             {
                 if (\$1 == \"cn:\") {
                     if (name) {