diff --git a/src/key/helper.js b/src/key/helper.js
index 97a68c26..3934cad9 100644
--- a/src/key/helper.js
+++ b/src/key/helper.js
@@ -218,7 +218,7 @@ export async function createSignaturePacket(dataToSign, privateKey, signingKeyPa
   Object.assign(signaturePacket, signatureProperties);
   signaturePacket.publicKeyAlgorithm = signingKeyPacket.algorithm;
   signaturePacket.hashAlgorithm = await getPreferredHashAlgo(privateKey, signingKeyPacket, date, userID, config);
-  signaturePacket.rawNotations = notations;
+  signaturePacket.rawNotations = [...notations];
   await signaturePacket.sign(signingKeyPacket, dataToSign, date, detached, config);
   return signaturePacket;
 }