diff --git a/src/keys/key.ts b/src/keys/key.ts
index c8fd240..f9e1c9d 100644
--- a/src/keys/key.ts
+++ b/src/keys/key.ts
@@ -17,6 +17,6 @@ export class CryptoKey extends core.CryptoKey {
   @JsonProp({ type: JsonPropTypes.String })
   protected kty = "oct";
 
-  @JsonProp({ type: JsonPropTypes.String })
+  @JsonProp({ type: JsonPropTypes.String, optional: true })
   protected alg = "";
 }
diff --git a/test/crypto.ts b/test/crypto.ts
index 7c895b8..2f48d68 100644
--- a/test/crypto.ts
+++ b/test/crypto.ts
@@ -67,7 +67,7 @@ context("Crypto", () => {
 
       it("Ed25519", async () => {
         const keys = await crypto.subtle.generateKey({ name: "eddsa", namedCurve: "ed25519" } as globalThis.EcKeyGenParams, false, ["sign", "verify"]);
-        
+
         assert.strictEqual(keys.privateKey.algorithm.name, "EdDSA");
         assert.strictEqual((keys.privateKey.algorithm as EcKeyAlgorithm).namedCurve, "Ed25519");
       });
@@ -195,4 +195,13 @@ context("Crypto", () => {
     });
   });
 
+  it("Import Secret JWK without 'alg' and 'key_ops' fields", async () => {
+    const aesKey = await crypto.subtle.generateKey({ name: "AES-CBC", length: 256 }, true, ["encrypt", "decrypt"]);
+    const jwk = await crypto.subtle.exportKey("jwk", aesKey);
+    delete jwk.key_ops;
+    delete jwk.alg;
+    const hmacKey = await crypto.subtle.importKey("jwk", jwk, { name: "HMAC", hash: "SHA-256" } as Algorithm, false, ["sign", "verify"]);
+    assert.strictEqual(hmacKey.algorithm.name, "HMAC");
+  });
+
 });