diff --git a/dmz/external-dns/values.yaml b/dmz/external-dns/values.yaml
index f25b1e2..2052942 100644
--- a/dmz/external-dns/values.yaml
+++ b/dmz/external-dns/values.yaml
@@ -5,6 +5,8 @@ external-dns:
   image:
     pullPolicy: Always
 
+  txtPrefix: "dmz-"
+
   sources:
     - service