diff --git a/src/message.ts b/src/message.ts
index f7df6f4..17b951e 100644
--- a/src/message.ts
+++ b/src/message.ts
@@ -3,7 +3,7 @@ import type {
   IMessage,
   IRateLimitProof,
 } from "@waku/interfaces";
-import utils from "@waku/utils/bytes";
+import * as utils from "@waku/utils/bytes";
 
 import { epochBytesToInt } from "./epoch.js";
 import { RLNInstance } from "./rln.js";
diff --git a/src/rln.ts b/src/rln.ts
index dd897f4..203ff91 100644
--- a/src/rln.ts
+++ b/src/rln.ts
@@ -227,7 +227,7 @@ export class RLNInstance {
   }
 
   verifyWithRoots(
-    proof: RateLimitProof | Uint8Array,
+    proof: IRateLimitProof | Uint8Array,
     msg: Uint8Array
   ): boolean {
     let pBytes: Uint8Array;