diff --git a/src/lib/PrivateKey.spec.ts b/src/lib/PrivateKey.spec.ts
index e32ae6b..dfc57ec 100644
--- a/src/lib/PrivateKey.spec.ts
+++ b/src/lib/PrivateKey.spec.ts
@@ -3,7 +3,7 @@ import { ProviderCrypto } from 'webcrypto-core';
 import { HashingAlgorithm } from './algorithms';
 import { PrivateKey, RsaPssPrivateKey } from './PrivateKey';
 
-const PROVIDER: ProviderCrypto = {} as any;
+const PROVIDER: ProviderCrypto = Symbol() as any;
 
 describe('PrivateKey', () => {
   const ALGORITHM: KeyAlgorithm = { name: 'RSA-PSS' };