diff --git a/utils/encoding.ts b/utils/encoding.ts
index 0eb1621..0214bbe 100644
--- a/utils/encoding.ts
+++ b/utils/encoding.ts
@@ -1,5 +1,7 @@
-export function base64URLEncode(str: Buffer) {
-  return str
+import { Buffer } from "buffer/";
+
+export function base64URLEncode(str: Uint8Array) {
+  return Buffer.from(str)
     .toString("base64")
     .replace(/\+/g, "-")
     .replace(/\//g, "_")