diff --git a/lib/msg-v3/validation.js b/lib/msg-v3/validation.js
index 100fc7a..971d170 100644
--- a/lib/msg-v3/validation.js
+++ b/lib/msg-v3/validation.js
@@ -150,7 +150,10 @@ function validateSignature(msg) {
     SIGNATURE_TAG_MSG_V3 + stringify(msg.metadata),
     'utf8'
   )
-  const keypair = { curve: 'ed25519', public: msg.pubkey }
+  const keypair = {
+    curve: /** @type {const} */ ('ed25519'),
+    public: msg.pubkey,
+  }
   const verified = Keypair.verify(keypair, signableBuf, sig)
   if (!verified) {
     return 'invalid msg: sig is invalid\n' + JSON.stringify(msg)