diff --git a/lib/core/util.js b/lib/core/util.js
index 9b566ef2962..8fc81dbd47c 100644
--- a/lib/core/util.js
+++ b/lib/core/util.js
@@ -443,14 +443,6 @@ function isDisturbed (body) {
   return !!(body && (stream.isDisturbed(body) || body[kBodyUsed]))
 }
 
-function isErrored (body) {
-  return !!(body && stream.isErrored(body))
-}
-
-function isReadable (body) {
-  return !!(body && stream.isReadable(body))
-}
-
 function getSocketInfo (socket) {
   return {
     localAddress: socket.localAddress,
@@ -674,8 +666,6 @@ module.exports = {
   kEnumerableProperty,
   nop,
   isDisturbed,
-  isErrored,
-  isReadable,
   toUSVString,
   isUSVString,
   isBlobLike,
diff --git a/lib/web/fetch/body.js b/lib/web/fetch/body.js
index 55718ac7c81..e5642dec70d 100644
--- a/lib/web/fetch/body.js
+++ b/lib/web/fetch/body.js
@@ -16,7 +16,7 @@ const { kState } = require('./symbols')
 const { webidl } = require('./webidl')
 const { Blob } = require('node:buffer')
 const assert = require('node:assert')
-const { isErrored } = require('../../core/util')
+const { isErrored } = require('node:stream')
 const { isArrayBuffer } = require('node:util/types')
 const { serializeAMimeType } = require('./data-url')
 const { multipartFormDataParser } = require('./formdata-parser')
diff --git a/lib/web/fetch/index.js b/lib/web/fetch/index.js
index 406ed7f31cb..efc0334f74f 100644
--- a/lib/web/fetch/index.js
+++ b/lib/web/fetch/index.js
@@ -58,8 +58,8 @@ const {
   subresourceSet
 } = require('./constants')
 const EE = require('node:events')
-const { Readable, pipeline, finished } = require('node:stream')
-const { addAbortListener, isErrored, isReadable, bufferToLowerCasedHeaderName } = require('../../core/util')
+const { Readable, pipeline, finished, isErrored, isReadable } = require('node:stream')
+const { addAbortListener, bufferToLowerCasedHeaderName } = require('../../core/util')
 const { dataURLProcessor, serializeAMimeType, minimizeSupportedMimeType } = require('./data-url')
 const { getGlobalDispatcher } = require('../../global')
 const { webidl } = require('./webidl')
@@ -327,7 +327,7 @@ function abortFetch (p, request, responseObject, error) {
 
   // 2. If request’s body is not null and is readable, then cancel request’s
   // body with error.
-  if (request.body != null && isReadable(request.body?.stream)) {
+  if (request.body?.stream != null && isReadable(request.body.stream)) {
     request.body.stream.cancel(error).catch((err) => {
       if (err.code === 'ERR_INVALID_STATE') {
         // Node bug?
@@ -347,7 +347,7 @@ function abortFetch (p, request, responseObject, error) {
 
   // 5. If response’s body is not null and is readable, then error response’s
   // body with error.
-  if (response.body != null && isReadable(response.body?.stream)) {
+  if (response.body?.stream != null && isReadable(response.body.stream)) {
     response.body.stream.cancel(error).catch((err) => {
       if (err.code === 'ERR_INVALID_STATE') {
         // Node bug?