diff --git a/texttospeech/test/audioProfile.test.js b/texttospeech/test/audioProfile.test.js
index 1219b851b6..310bdd6490 100644
--- a/texttospeech/test/audioProfile.test.js
+++ b/texttospeech/test/audioProfile.test.js
@@ -17,7 +17,9 @@
 
 const fs = require('fs');
 const {assert} = require('chai');
-const {execSync} = require('child_process');
+const cp = require('child_process');
+
+const execSync = cmd => cp.execSync(cmd, {encoding: 'utf-8'});
 
 const cmd = 'node audioProfile.js';
 const text = 'Hello Everybody!  This is an Audio Profile Optimized Sound Byte.';
diff --git a/texttospeech/test/listVoices.test.js b/texttospeech/test/listVoices.test.js
index c35bd671eb..ae743c7b01 100644
--- a/texttospeech/test/listVoices.test.js
+++ b/texttospeech/test/listVoices.test.js
@@ -16,7 +16,9 @@
 'use strict';
 
 const {assert} = require('chai');
-const {execSync} = require('child_process');
+const cp = require('child_process');
+
+const execSync = cmd => cp.execSync(cmd, {encoding: 'utf-8'});
 
 const cmd = 'node listVoices.js';
 
diff --git a/texttospeech/test/quickstart.test.js b/texttospeech/test/quickstart.test.js
index 946f908c2e..e0a4d54a3b 100644
--- a/texttospeech/test/quickstart.test.js
+++ b/texttospeech/test/quickstart.test.js
@@ -17,7 +17,9 @@
 
 const fs = require('fs');
 const {assert} = require('chai');
-const {execSync} = require('child_process');
+const cp = require('child_process');
+
+const execSync = cmd => cp.execSync(cmd, {encoding: 'utf-8'});
 
 const outputFile = 'output.mp3';
 
diff --git a/texttospeech/test/synthesize.test.js b/texttospeech/test/synthesize.test.js
index 45b7500918..526c41f0c0 100644
--- a/texttospeech/test/synthesize.test.js
+++ b/texttospeech/test/synthesize.test.js
@@ -18,7 +18,9 @@
 const fs = require('fs');
 const path = require('path');
 const {assert} = require('chai');
-const {execSync} = require('child_process');
+const cp = require('child_process');
+
+const execSync = cmd => cp.execSync(cmd, {encoding: 'utf-8'});
 
 const cmd = 'node synthesize.js';
 const text = 'Hello there.';