diff --git a/package.json b/package.json
index 205f4e01..92546b38 100644
--- a/package.json
+++ b/package.json
@@ -30,7 +30,6 @@
     "xtend": "^4.0.2"
   },
   "devDependencies": {
-    "deep-equal": "^2.0.3",
     "express": "^4.21.2",
     "form-data": "^4.0.2",
     "fs-temp": "^1.2.1",
diff --git a/test/_util.js b/test/_util.js
index a6782ad8..b6e787c6 100644
--- a/test/_util.js
+++ b/test/_util.js
@@ -27,3 +27,21 @@ exports.submitForm = function submitForm (multer, form, cb) {
     })
   })
 }
+
+exports.toNullProtoDeep = function toNullProtoDeep (value) {
+  if (Array.isArray(value)) {
+    return value.map(function (item) { return toNullProtoDeep(item) })
+  }
+
+  if (value && typeof value === 'object') {
+    var out = Object.create(null)
+
+    Object.keys(value).forEach(function (key) {
+      out[key] = toNullProtoDeep(value[key])
+    })
+
+    return out
+  }
+
+  return value
+}
diff --git a/test/disk-storage.js b/test/disk-storage.js
index bc923ab5..a533ae19 100644
--- a/test/disk-storage.js
+++ b/test/disk-storage.js
@@ -1,7 +1,6 @@
 /* eslint-env mocha */
 
 var assert = require('assert')
-var deepEqual = require('deep-equal')
 
 var fs = require('fs')
 var path = require('path')
@@ -71,9 +70,9 @@ describe('Disk Storage', function () {
       assert.strictEqual(req.body.version, '')
       assert.strictEqual(req.body.year, '')
 
-      assert(deepEqual(req.body.checkboxfull, ['cb1', 'cb2']))
-      assert(deepEqual(req.body.checkboxhalfempty, ['cb1', '']))
-      assert(deepEqual(req.body.checkboxempty, ['', '']))
+      assert.deepStrictEqual(req.body.checkboxfull, ['cb1', 'cb2'])
+      assert.deepStrictEqual(req.body.checkboxhalfempty, ['cb1', ''])
+      assert.deepStrictEqual(req.body.checkboxempty, ['', ''])
 
       assert.strictEqual(req.file.fieldname, 'empty')
       assert.strictEqual(req.file.originalname, 'empty.dat')
@@ -107,7 +106,7 @@ describe('Disk Storage', function () {
     util.submitForm(parser, form, function (err, req) {
       assert.ifError(err)
 
-      assert(deepEqual(req.body, {}))
+      assert.deepStrictEqual(req.body, util.toNullProtoDeep({}))
 
       assert.strictEqual(req.files.empty[0].fieldname, 'empty')
       assert.strictEqual(req.files.empty[0].originalname, 'empty.dat')
@@ -158,10 +157,10 @@ describe('Disk Storage', function () {
     util.submitForm(parser, form, function (err, req) {
       assert.strictEqual(err.code, 'LIMIT_UNEXPECTED_FILE')
       assert.strictEqual(err.field, 'small0')
-      assert(deepEqual(err.storageErrors, []))
+      assert.deepStrictEqual(err.storageErrors, [])
 
       var files = fs.readdirSync(uploadDir)
-      assert(deepEqual(files, []))
+      assert.deepStrictEqual(files, [])
 
       done()
     })
diff --git a/test/fields.js b/test/fields.js
index 1bdf6459..a5754d08 100644
--- a/test/fields.js
+++ b/test/fields.js
@@ -1,13 +1,20 @@
 /* eslint-env mocha */
 
 var assert = require('assert')
-var deepEqual = require('deep-equal')
 var stream = require('stream')
 
 var util = require('./_util')
 var multer = require('../')
 var FormData = require('form-data')
-var testData = require('testdata-w3c-json-form')
+var rawTestData = require('testdata-w3c-json-form')
+
+var testData = rawTestData.map(function (t) {
+  return {
+    name: t.name,
+    fields: t.fields,
+    expected: util.toNullProtoDeep(t.expected)
+  }
+})
 
 describe('Fields', function () {
   var parser
@@ -25,7 +32,7 @@ describe('Fields', function () {
 
     util.submitForm(parser, form, function (err, req) {
       assert.ifError(err)
-      assert(deepEqual(req.body, {
+      assert.deepStrictEqual(req.body, util.toNullProtoDeep({
         name: 'Multer',
         key: 'value',
         abc: 'xyz'
@@ -49,7 +56,7 @@ describe('Fields', function () {
 
     util.submitForm(parser, form, function (err, req) {
       assert.ifError(err)
-      assert(deepEqual(req.body, {
+      assert.deepStrictEqual(req.body, util.toNullProtoDeep({
         name: 'Multer',
         key: '',
         abc: '',
@@ -107,7 +114,7 @@ describe('Fields', function () {
 
       util.submitForm(parser, form, function (err, req) {
         assert.ifError(err)
-        assert(deepEqual(req.body, test.expected))
+        assert.deepStrictEqual(req.body, test.expected)
         done()
       })
     })
@@ -122,7 +129,7 @@ describe('Fields', function () {
 
     util.submitForm(parser, form, function (err, req) {
       assert.ifError(err)
-      assert(deepEqual(req.body, {
+      assert.deepStrictEqual(req.body, util.toNullProtoDeep({
         obj: {
           0: 'a',
           2: 'c',
diff --git a/test/memory-storage.js b/test/memory-storage.js
index cbc3e2e5..5a9479ab 100644
--- a/test/memory-storage.js
+++ b/test/memory-storage.js
@@ -1,7 +1,6 @@
 /* eslint-env mocha */
 
 var assert = require('assert')
-var deepEqual = require('deep-equal')
 
 var util = require('./_util')
 var multer = require('../')
@@ -58,9 +57,9 @@ describe('Memory Storage', function () {
       assert.strictEqual(req.body.version, '')
       assert.strictEqual(req.body.year, '')
 
-      assert(deepEqual(req.body.checkboxfull, ['cb1', 'cb2']))
-      assert(deepEqual(req.body.checkboxhalfempty, ['cb1', '']))
-      assert(deepEqual(req.body.checkboxempty, ['', '']))
+      assert.deepStrictEqual(req.body.checkboxfull, ['cb1', 'cb2'])
+      assert.deepStrictEqual(req.body.checkboxhalfempty, ['cb1', ''])
+      assert.deepStrictEqual(req.body.checkboxempty, ['', ''])
 
       assert.strictEqual(req.file.fieldname, 'empty')
       assert.strictEqual(req.file.originalname, 'empty.dat')
@@ -95,7 +94,7 @@ describe('Memory Storage', function () {
     util.submitForm(parser, form, function (err, req) {
       assert.ifError(err)
 
-      assert(deepEqual(req.body, {}))
+      assert.deepStrictEqual(req.body, util.toNullProtoDeep({}))
 
       assert.strictEqual(req.files.empty[0].fieldname, 'empty')
       assert.strictEqual(req.files.empty[0].originalname, 'empty.dat')