1 files changed, 10 insertions, 3 deletions
diff --git a/ext/crypto/01_webidl.js b/ext/crypto/01_webidl.js
index 67156ce3a..739648766 100644
--- a/ext/crypto/01_webidl.js
+++ b/ext/crypto/01_webidl.js
@@ -9,7 +9,11 @@
 ((window) => {
   const webidl = window.__bootstrap.webidl;
   const { CryptoKey } = window.__bootstrap.crypto;
-  const { ArrayBufferIsView, ArrayBuffer } = window.__bootstrap.primordials;
+  const {
+    ArrayBufferIsView,
+    ArrayBufferPrototype,
+    ObjectPrototypeIsPrototypeOf,
+  } = window.__bootstrap.primordials;
 
   webidl.converters.AlgorithmIdentifier = (V, opts) => {
     // Union for (object or DOMString)
@@ -21,7 +25,10 @@
 
   webidl.converters["BufferSource or JsonWebKey"] = (V, opts) => {
     // Union for (BufferSource or JsonWebKey)
-    if (ArrayBufferIsView(V) || V instanceof ArrayBuffer) {
+    if (
+      ArrayBufferIsView(V) ||
+      ObjectPrototypeIsPrototypeOf(ArrayBufferPrototype, V)
+    ) {
       return webidl.converters.BufferSource(V, opts);
     }
     return webidl.converters.JsonWebKey(V, opts);
@@ -460,7 +467,7 @@
 
   webidl.converters.CryptoKey = webidl.createInterfaceConverter(
     "CryptoKey",
-    CryptoKey,
+    CryptoKey.prototype,
   );
 
   const dictCryptoKeyPair = [