diff --git a/src/chunk.js b/src/chunk.js
deleted file mode 100644
index 08c1ec001..000000000
--- a/src/chunk.js
+++ /dev/null
@@ -1,20 +0,0 @@
-'use strict';
-
-exports = module.exports = chunk;
-
-const assert = require('assert');
-
-function chunk(array, size) {
-    assert(Array.isArray(array));
-    assert.strictEqual(typeof size, 'number');
-
-    const length = array.length;
-    if (!length) return [];
-    let index = 0, resIndex = 0, result = Array(Math.ceil(length / size));
-
-    for (; index < length; index += size) {
-        result[resIndex++] = array.slice(index, index+size);
-    }
-
-    return result;
-}
diff --git a/src/storage/s3.js b/src/storage/s3.js
index 6f4c58a10..46466eace 100644
--- a/src/storage/s3.js
+++ b/src/storage/s3.js
@@ -22,14 +22,14 @@ exports = module.exports = {
 
     // Used to mock AWS
     _mockInject: mockInject,
-    _mockRestore: mockRestore
+    _mockRestore: mockRestore,
+    _chunk: chunk
 };
 
 const assert = require('assert'),
     async = require('async'),
     AwsSdk = require('aws-sdk'),
     BoxError = require('../boxerror.js'),
-    chunk = require('../chunk.js'),
     constants = require('../constants.js'),
     DataLayout = require('../datalayout.js'),
     debug = require('debug')('box:storage/s3'),
@@ -406,6 +406,21 @@ async function remove(apiConfig, filename) {
     if (error) throw new BoxError(BoxError.EXTERNAL_ERROR, `Unable to remove ${deleteParams.Key}. error: ${error.message}`);
 }
 
+function chunk(array, size) {
+    assert(Array.isArray(array));
+    assert.strictEqual(typeof size, 'number');
+
+    const length = array.length;
+    if (!length) return [];
+    let index = 0, resIndex = 0, result = Array(Math.ceil(length / size));
+
+    for (; index < length; index += size) {
+        result[resIndex++] = array.slice(index, index+size);
+    }
+
+    return result;
+}
+
 async function removeDir(apiConfig, pathPrefix, progressCallback) {
     assert.strictEqual(typeof apiConfig, 'object');
     assert.strictEqual(typeof pathPrefix, 'string');
diff --git a/src/test/storage-test.js b/src/test/storage-test.js
index 7ce53da98..fb96bed34 100644
--- a/src/test/storage-test.js
+++ b/src/test/storage-test.js
@@ -7,7 +7,6 @@
 'use strict';
 
 const BoxError = require('../boxerror.js'),
-    chunk = require('../chunk.js');
     common = require('./common.js'),
     execSync = require('child_process').execSync,
     expect = require('expect.js'),
@@ -24,6 +23,8 @@ const BoxError = require('../boxerror.js'),
     safe = require('safetydance'),
     settings = require('../settings.js');
 
+const chunk = s3._chunk;
+
 describe('Storage', function () {
     const { setup, cleanup } = common;