diff --git a/ext/fetch/23_response.js b/ext/fetch/23_response.js
index d5adb80428ae06..542a6202091121 100644
--- a/ext/fetch/23_response.js
+++ b/ext/fetch/23_response.js
@@ -34,6 +34,7 @@
   const {
     ArrayPrototypeMap,
     ArrayPrototypePush,
+    ObjectDefineProperties,
     ObjectPrototypeIsPrototypeOf,
     RangeError,
     RegExp,
@@ -287,7 +288,7 @@
      * @param {ResponseInit} init
      * @returns {Response}
      */
-    static json(data, init = {}) {
+    static json(data = undefined, init = {}) {
       const prefix = "Failed to call 'Response.json'";
       data = webidl.converters.any(data);
       init = webidl.converters["ResponseInit_fast"](init, {
@@ -435,6 +436,11 @@
   }
 
   webidl.configurePrototype(Response);
+  ObjectDefineProperties(Response, {
+    json: { enumerable: true },
+    redirect: { enumerable: true },
+    error: { enumerable: true },
+  });
   const ResponsePrototype = Response.prototype;
   mixinBody(ResponsePrototype, _body, _mimeType);
 
diff --git a/tools/wpt/expectation.json b/tools/wpt/expectation.json
index 6eee11ef890fe6..c58b8934f1b697 100644
--- a/tools/wpt/expectation.json
+++ b/tools/wpt/expectation.json
@@ -3173,9 +3173,6 @@
         "Request interface: new Request('about:blank') must inherit property \"isReloadNavigation\" with the proper type",
         "Request interface: new Request('about:blank') must inherit property \"isHistoryNavigation\" with the proper type",
         "Request interface: new Request('about:blank') must inherit property \"duplex\" with the proper type",
-        "Response interface: operation error()",
-        "Response interface: operation redirect(USVString, optional unsigned short)",
-        "Response interface: operation json(any, optional ResponseInit)",
         "Response interface: attribute body",
         "Response interface: attribute bodyUsed",
         "Response interface: calling redirect(USVString, optional unsigned short) on new Response() with too few arguments must throw TypeError",
@@ -3206,9 +3203,6 @@
         "Request interface: new Request('about:blank') must inherit property \"isReloadNavigation\" with the proper type",
         "Request interface: new Request('about:blank') must inherit property \"isHistoryNavigation\" with the proper type",
         "Request interface: new Request('about:blank') must inherit property \"duplex\" with the proper type",
-        "Response interface: operation error()",
-        "Response interface: operation redirect(USVString, optional unsigned short)",
-        "Response interface: operation json(any, optional ResponseInit)",
         "Response interface: attribute body",
         "Response interface: attribute bodyUsed",
         "Response interface: calling redirect(USVString, optional unsigned short) on new Response() with too few arguments must throw TypeError",