diff --git a/README.md b/README.md
index b7aae0f..97c2c40 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@ utilities provided by `@better-auth/utils`:
 |-------------------|----------------------------------------------------|
 | [**Digest**](#digest) | Hash inputs using sha family hash functions.      |
 | [**HMAC**](#hmac) | Hash inputs using HMAC with a secret key.          |
-| [**Random String**](#random-string) | Generate random strings with a specified length and charset. |
+| [**Random**](#random-string) | Generate random strings with a specified length and charset. |
 | [**RSA**](#rsa)   | Perform encryption, decryption, signing, and verification with RSA keys. |
 | [**ECDSA**](#ecdsa) | Perform signing and verification with ECDSA keys. |
 | [**Base64**](#base64) | Encode and decode data in base64 format.          |
diff --git a/src/cookies.ts b/src/cookies.ts
index dfd5350..1f3f054 100644
--- a/src/cookies.ts
+++ b/src/cookies.ts
@@ -103,13 +103,15 @@ export const cookies = {
 		const { name, value, attributes } = input;
 		const opt = { ...attributes };
 		const signature = input.signed
-			? await hmac.sign(input.signed.key, value)
+			? await hmac.sign(input.signed.key, {
+				data: value,
+			})
 			: undefined;
 		const base64Signature = signature
 			? await base64.encode(signature, {
-					urlSafe: true,
-					padding: false,
-				})
+				urlSafe: true,
+				padding: false,
+			})
 			: undefined;
 		const _value = base64Signature ? `${value}.${base64Signature}` : value;
 		let cookie = `${name}=${encodeURIComponent(_value)}`;