diff --git a/test/parallel/parallel.status b/test/parallel/parallel.status
index 75d543420dea53..8e070688b1f250 100644
--- a/test/parallel/parallel.status
+++ b/test/parallel/parallel.status
@@ -25,8 +25,6 @@ test-worker-memory: PASS,FLAKY
 test-worker-message-port-transfer-terminate: PASS,FLAKY
 
 [$system==linux]
-# https://github.com/nodejs/node/issues/35586
-test-webcrypto-encrypt-decrypt-aes: PASS,FLAKY
 
 [$system==macos]
 
diff --git a/test/parallel/test-webcrypto-encrypt-decrypt-aes.js b/test/parallel/test-webcrypto-encrypt-decrypt-aes.js
index 38d2b70bcb0567..7adb18918d2205 100644
--- a/test/parallel/test-webcrypto-encrypt-decrypt-aes.js
+++ b/test/parallel/test-webcrypto-encrypt-decrypt-aes.js
@@ -9,6 +9,9 @@ const assert = require('assert');
 const { getRandomValues, subtle } = require('crypto').webcrypto;
 
 async function testEncrypt({ keyBuffer, algorithm, plaintext, result }) {
+  // Using a copy of plaintext to prevent tampering of the original
+  plaintext = Buffer.from(plaintext);
+
   const key = await subtle.importKey(
     'raw',
     keyBuffer,
@@ -23,8 +26,10 @@ async function testEncrypt({ keyBuffer, algorithm, plaintext, result }) {
     Buffer.from(output).toString('hex'),
     Buffer.from(result).toString('hex'));
 
-  const check = await subtle.decrypt(algorithm, key, output);
-  output[0] = 255 - output[0];
+  // Converting the returned ArrayBuffer into a Buffer right away,
+  // so that the next line works
+  const check = Buffer.from(await subtle.decrypt(algorithm, key, output));
+  check[0] = 255 - check[0];
 
   assert.strictEqual(
     Buffer.from(check).toString('hex'),