diff --git a/src/keys/key.ts b/src/keys/key.ts
index 384fea7..24eef4a 100644
--- a/src/keys/key.ts
+++ b/src/keys/key.ts
@@ -15,7 +15,7 @@ export class CryptoKey extends core.CryptoKey {
   public usages: KeyUsage[] = [];
 
   @JsonProp({ type: JsonPropTypes.String })
-  protected kty: string = "octet";
+  protected kty: string = "oct";
 
   @JsonProp({ type: JsonPropTypes.String })
   protected alg: string = "";