diff --git a/src.ts/crypto/signing-key.ts b/src.ts/crypto/signing-key.ts
index d92f5e9c7d..bc01021583 100644
--- a/src.ts/crypto/signing-key.ts
+++ b/src.ts/crypto/signing-key.ts
@@ -180,7 +180,7 @@ export class SigningKey {
         const der = secp256k1.Signature.fromCompact(getBytesCopy(concat([ sig.r, sig.s ]))).toDERRawBytes();
 
         const pubKey = secp256k1.recoverPublicKey(getBytesCopy(digest), der, sig.yParity);
-        assertArgument(pubKey != null, "invalid signautre for digest", "signature", signature);
+        assertArgument(pubKey != null, "invalid signature for digest", "signature", signature);
 
         return hexlify(pubKey);
     }