diff --git a/packages/jwt/src/signer.ts b/packages/jwt/src/signer.ts
index bf61792..834aed1 100644
--- a/packages/jwt/src/signer.ts
+++ b/packages/jwt/src/signer.ts
@@ -22,6 +22,6 @@ export function createJwtSigner(keypair: Keypair): JwtSigner {
     case "Ed25519":
       return EdDSASigner(keypair.privateKey)
     default:
-      throw new Error("Unsupported algorithm", keypair.curve)
+      throw new Error(`Unsupported algorithm: ${keypair.curve}`)
   }
 }