diff --git a/benchmark/streams/readable-bigread.js b/benchmark/streams/readable-bigread.js
index 50f10c44119141..34d478fb478478 100644
--- a/benchmark/streams/readable-bigread.js
+++ b/benchmark/streams/readable-bigread.js
@@ -1,7 +1,6 @@
 'use strict';
 
 const common = require('../common');
-const v8 = require('v8');
 const Readable = require('stream').Readable;
 
 const bench = common.createBenchmark(main, {
@@ -15,13 +14,6 @@ function main(conf) {
   function noop() {}
   s._read = noop;
 
-  // Force optimization before starting the benchmark
-  s.push(b);
-  v8.setFlagsFromString('--allow_natives_syntax');
-  eval('%OptimizeFunctionOnNextCall(s.read)');
-  s.push(b);
-  while (s.read(128));
-
   bench.start();
   for (var k = 0; k < n; ++k) {
     for (var i = 0; i < 1e4; ++i)
diff --git a/benchmark/streams/readable-bigunevenread.js b/benchmark/streams/readable-bigunevenread.js
index ce6e41c5d30eac..d176166ae4f432 100644
--- a/benchmark/streams/readable-bigunevenread.js
+++ b/benchmark/streams/readable-bigunevenread.js
@@ -1,7 +1,6 @@
 'use strict';
 
 const common = require('../common');
-const v8 = require('v8');
 const Readable = require('stream').Readable;
 
 const bench = common.createBenchmark(main, {
@@ -15,13 +14,6 @@ function main(conf) {
   function noop() {}
   s._read = noop;
 
-  // Force optimization before starting the benchmark
-  s.push(b);
-  v8.setFlagsFromString('--allow_natives_syntax');
-  eval('%OptimizeFunctionOnNextCall(s.read)');
-  s.push(b);
-  while (s.read(106));
-
   bench.start();
   for (var k = 0; k < n; ++k) {
     for (var i = 0; i < 1e4; ++i)
diff --git a/benchmark/streams/readable-boundaryread.js b/benchmark/streams/readable-boundaryread.js
index 93a6616361ba18..1a0b7eb7ac9ddc 100644
--- a/benchmark/streams/readable-boundaryread.js
+++ b/benchmark/streams/readable-boundaryread.js
@@ -1,7 +1,6 @@
 'use strict';
 
 const common = require('../common');
-const v8 = require('v8');
 const Readable = require('stream').Readable;
 
 const bench = common.createBenchmark(main, {
@@ -15,14 +14,6 @@ function main(conf) {
   function noop() {}
   s._read = noop;
 
-  // Force optimization before starting the benchmark
-  s.push(b);
-  v8.setFlagsFromString('--allow_natives_syntax');
-  eval('%OptimizeFunctionOnNextCall(s.push)');
-  eval('%OptimizeFunctionOnNextCall(s.read)');
-  s.push(b);
-  while (s.read(32));
-
   bench.start();
   for (var k = 0; k < n; ++k) {
     for (var i = 0; i < 1e4; ++i)
diff --git a/benchmark/streams/readable-readall.js b/benchmark/streams/readable-readall.js
index 07626fd7978b9a..be34afbeabc090 100644
--- a/benchmark/streams/readable-readall.js
+++ b/benchmark/streams/readable-readall.js
@@ -1,7 +1,6 @@
 'use strict';
 
 const common = require('../common');
-const v8 = require('v8');
 const Readable = require('stream').Readable;
 
 const bench = common.createBenchmark(main, {
@@ -15,13 +14,6 @@ function main(conf) {
   function noop() {}
   s._read = noop;
 
-  // Force optimization before starting the benchmark
-  s.push(b);
-  v8.setFlagsFromString('--allow_natives_syntax');
-  eval('%OptimizeFunctionOnNextCall(s.read)');
-  s.push(b);
-  while (s.read());
-
   bench.start();
   for (var k = 0; k < n; ++k) {
     for (var i = 0; i < 1e4; ++i)
diff --git a/benchmark/streams/readable-unevenread.js b/benchmark/streams/readable-unevenread.js
index 4a69bd97a94bcf..ebbc727ad23ec3 100644
--- a/benchmark/streams/readable-unevenread.js
+++ b/benchmark/streams/readable-unevenread.js
@@ -1,7 +1,6 @@
 'use strict';
 
 const common = require('../common');
-const v8 = require('v8');
 const Readable = require('stream').Readable;
 
 const bench = common.createBenchmark(main, {
@@ -15,13 +14,6 @@ function main(conf) {
   function noop() {}
   s._read = noop;
 
-  // Force optimization before starting the benchmark
-  s.push(b);
-  v8.setFlagsFromString('--allow_natives_syntax');
-  eval('%OptimizeFunctionOnNextCall(s.read)');
-  s.push(b);
-  while (s.read(12));
-
   bench.start();
   for (var k = 0; k < n; ++k) {
     for (var i = 0; i < 1e4; ++i)