diff --git a/src/nextjs/index.ts b/src/nextjs/index.ts
index 0f83886..a8cb463 100644
--- a/src/nextjs/index.ts
+++ b/src/nextjs/index.ts
@@ -74,7 +74,16 @@ export const convexBetterAuthNextJs = (
   const cachedGetToken = cache(
     async ({ forceRefresh }: { forceRefresh?: boolean } = {}) => {
       const headers = await (await import("next/headers.js")).headers();
-      return getToken(siteUrl, headers, { ...opts, forceRefresh });
+      const mutableHeaders = new Headers();
+      const cookie = headers.get("cookie");
+      if (cookie) {
+        mutableHeaders.set("cookie", cookie);
+      }
+      const userAgent = headers.get("user-agent");
+      if (userAgent) {
+        mutableHeaders.set("user-agent", userAgent);
+      }
+      return getToken(siteUrl, mutableHeaders, { ...opts, forceRefresh });
     }
   );