diff --git a/google/cloud/pubsublite/internal/endpoints.py b/google/cloud/pubsublite/internal/endpoints.py
index 282897e2..9db27eb5 100644
--- a/google/cloud/pubsublite/internal/endpoints.py
+++ b/google/cloud/pubsublite/internal/endpoints.py
@@ -16,4 +16,4 @@
 
 
 def regional_endpoint(region: CloudRegion):
-    return f"{region}-pubsublite.googleapis.com"
+    return f"dns:///{region}-pubsublite.googleapis.com"