diff --git a/src/services/crypto.service.ts b/src/services/crypto.service.ts
index 697bf76cc4..f01f05b5c0 100644
--- a/src/services/crypto.service.ts
+++ b/src/services/crypto.service.ts
@@ -609,8 +609,7 @@ export class CryptoService implements CryptoServiceAbstraction {
             t.set(previousT);
             t.set(info, previousT.length);
             t.set([i + 1], t.length - 1);
-            const hmac = await this.cryptoFunctionService.hmac(t.buffer, prk, 'sha256');
-            previousT = new Uint8Array(hmac);
+            previousT = new Uint8Array(await this.cryptoFunctionService.hmac(t.buffer, prk, 'sha256'));
             okm.set(previousT, i * hashLen);
         }
         return okm;