diff --git a/assets/themes/postal_codes.json b/assets/themes/postal_codes.json
index ae8fb297aa..7198789360 100644
--- a/assets/themes/postal_codes.json
+++ b/assets/themes/postal_codes.json
@@ -20,6 +20,7 @@
   "startZoom": 1,
   "widenFactor": 0.05,
   "socialImage": "",
+  "hideFromOverview": true,
   "layers": [
     {
       "id": "postal_codes",