diff --git a/apps/cm/app/api/proxy/[...url]/route.ts b/apps/cm/app/api/proxy/[...url]/route.ts
index c0f646cd2..57cfc86e8 100644
--- a/apps/cm/app/api/proxy/[...url]/route.ts
+++ b/apps/cm/app/api/proxy/[...url]/route.ts
@@ -2,6 +2,7 @@ import {
   ACCESS_TOKEN,
   AUTH_USER_ID,
   CLAIM_NAME,
+  COOKIE_DOMAIN,
   REFRESH_TOKEN,
   SERVER_API_URL,
   SITE_ID,
@@ -135,6 +136,7 @@ async function handler(
         cookieStore.set(REFRESH_TOKEN, refreshToken, {
           httpOnly: true,
           sameSite: "lax",
+          domain: COOKIE_DOMAIN,
           path: "/",
         });
       }