diff --git a/doc/api/webcrypto.md b/doc/api/webcrypto.md
index 0c5fa8b413b992..07677b8f180de9 100644
--- a/doc/api/webcrypto.md
+++ b/doc/api/webcrypto.md
@@ -330,7 +330,7 @@ async function pbkdf2Key(pass, salt, iterations = 1000, length = 256) {
     iterations,
   }, keyMaterial, {
     name: 'AES-GCM',
-    length: 256,
+    length,
   }, true, ['encrypt', 'decrypt']);
   return key;
 }