diff --git a/render.yaml b/render.yaml
index 63a09bf..04a436c 100644
--- a/render.yaml
+++ b/render.yaml
@@ -46,6 +46,9 @@ services:
     healthCheckPath: /health
     envVars:
       - key: ORIGIN_WHITELIST
-        sync: false
+        fromService:
+          type: web
+          name: "Owlbear Rodeo Legacy"
+          envVarKey: RENDER_EXTERNAL_HOSTNAME
       - key: PORT
         value: 9000
\ No newline at end of file