diff --git a/app/auth/sign-in/page.tsx b/app/auth/sign-in/page.tsx
index a8b565ac..59709b12 100644
--- a/app/auth/sign-in/page.tsx
+++ b/app/auth/sign-in/page.tsx
@@ -20,7 +20,8 @@ export default async function SignInPage({
 
     // If reauth is requested, always render the form (no redirect).
     if (!reauth) {
-        const at = cookies().get("ma_at")?.value;
+        const ck = await cookies();
+        const at = ck.get("ma_at")?.value;
         if (at) redirect("/portal");
     }