diff --git a/lib/fetch/body.js b/lib/fetch/body.js
index 199485eaa10..e5c4b222d67 100644
--- a/lib/fetch/body.js
+++ b/lib/fetch/body.js
@@ -75,8 +75,9 @@ function extractBody (object, keepalive = false) {
     const prefix = `--${boundary}\r\nContent-Disposition: form-data`
 
     /*! formdata-polyfill. MIT License. Jimmy Wärting <https://jimmy.warting.se/opensource> */
-    const escape = str => str.replace(/\n/g, '%0A').replace(/\r/g, '%0D').replace(/"/g, '%22')
-    const normalizeLinefeeds = value => value.replace(/\r?\n|\r/g, '\r\n')
+    const escape = (str) =>
+      str.replace(/\n/g, '%0A').replace(/\r/g, '%0D').replace(/"/g, '%22')
+    const normalizeLinefeeds = (value) => value.replace(/\r?\n|\r/g, '\r\n')
 
     // Set action to this step: run the multipart/form-data
     // encoding algorithm, with object’s entry list and UTF-8.
@@ -94,7 +95,8 @@ function extractBody (object, keepalive = false) {
           yield enc.encode(
             prefix +
               `; name="${escape(normalizeLinefeeds(name))}"` +
-              (value.filename ? `; filename="${escape(value.filename)}"` : '') + '\r\n' +
+              (value.filename ? `; filename="${escape(value.filename)}"` : '') +
+              '\r\n' +
               `Content-Type: ${
                 value.type || 'application/octet-stream'
               }\r\n\r\n`
@@ -149,9 +151,8 @@ function extractBody (object, keepalive = false) {
       )
     }
 
-    stream = object instanceof ReadableStream
-      ? object
-      : ReadableStreamFrom(object)
+    stream =
+      object instanceof ReadableStream ? object : ReadableStreamFrom(object)
   } else {
     // TODO: byte sequence?
     // TODO: scalar value string?
diff --git a/lib/fetch/request.js b/lib/fetch/request.js
index c97438acc46..152d888f91b 100644
--- a/lib/fetch/request.js
+++ b/lib/fetch/request.js
@@ -5,7 +5,11 @@
 const { extractBody, mixinBody, cloneBody } = require('./body')
 const { Headers, fill: fillHeaders, HeadersList } = require('./headers')
 const util = require('../core/util')
-const { isValidHTTPToken, EnvironmentSettingsObject, toUSVString } = require('./util')
+const {
+  isValidHTTPToken,
+  EnvironmentSettingsObject,
+  toUSVString
+} = require('./util')
 const {
   forbiddenMethods,
   corsSafeListedMethods,
diff --git a/lib/fetch/util.js b/lib/fetch/util.js
index b39587ca363..fcf187e3a83 100644
--- a/lib/fetch/util.js
+++ b/lib/fetch/util.js
@@ -2,6 +2,7 @@
 
 const { redirectStatus } = require('./constants')
 const { performance } = require('perf_hooks')
+const nodeUtil = require('util')
 
 let ReadableStream
 
@@ -280,23 +281,6 @@ function tryUpgradeRequestToAPotentiallyTrustworthyURL (request) {
   // TODO
 }
 
-function _toUSVString (val) {
-  // TODO: This is internal to node core...
-  return val
-}
-
-const unpairedSurrogateRe =
-  /(?:[^\uD800-\uDBFF]|^)[\uDC00-\uDFFF]|[\uD800-\uDBFF](?![\uDC00-\uDFFF])/
-
-// https://github.com/nodejs/node/blob/7ca38f05a023666274569343f128c5aed81599f3/lib/internal/url.js#L144
-function toUSVString (val) {
-  const str = `${val}`
-  // As of V8 5.5, `str.search()` (and `unpairedSurrogateRe[@@search]()`) are
-  // slower than `unpairedSurrogateRe.exec()`.
-  const match = unpairedSurrogateRe.exec(str)
-  return match ? _toUSVString(str, match.index) : str
-}
-
 class ServiceWorkerGlobalScope {} // dummy
 class Window {} // dummy
 class EnvironmentSettingsObject {} // dummy
@@ -307,7 +291,7 @@ module.exports = {
   ServiceWorkerGlobalScope,
   Window,
   EnvironmentSettingsObject,
-  toUSVString,
+  toUSVString: nodeUtil.toUSVString || ((val) => `${val}`),
   tryUpgradeRequestToAPotentiallyTrustworthyURL,
   coarsenedSharedCurrentTime,
   matchRequestIntegrity,