diff --git a/lib/stream.js b/lib/stream.js
index 420415a2259827..a26cc0b81c557e 100644
--- a/lib/stream.js
+++ b/lib/stream.js
@@ -61,7 +61,9 @@ Stream.isReadable = utils.isReadable;
 Stream.isWritable = utils.isWritable;
 
 Stream.Readable = require('internal/streams/readable');
-for (const key of ObjectKeys(streamReturningOperators)) {
+const streamKeys = ObjectKeys(streamReturningOperators);
+for (let i = 0; i < streamKeys.length; i++) {
+  const key = streamKeys[i];
   const op = streamReturningOperators[key];
   function fn(...args) {
     if (new.target) {
@@ -79,7 +81,9 @@ for (const key of ObjectKeys(streamReturningOperators)) {
     writable: true,
   });
 }
-for (const key of ObjectKeys(promiseReturningOperators)) {
+const promiseKeys = ObjectKeys(promiseReturningOperators);
+for (let i = 0; i < promiseKeys.length; i++) {
+  const key = promiseKeys[i];
   const op = promiseReturningOperators[key];
   function fn(...args) {
     if (new.target) {