diff --git a/examples/jasmine-cli/src/sum.spec.js b/examples/jasmine-cli/src/sum.spec.js
index 4ba9c74..034be26 100644
--- a/examples/jasmine-cli/src/sum.spec.js
+++ b/examples/jasmine-cli/src/sum.spec.js
@@ -1,14 +1,14 @@
-describe('sum(a, b)', () => {
-  beforeEach(() => {
+describe('sum(a, b)', function () {
+  beforeEach(function () {
     this.sum = require('./sum');
   });
-  it('is a function', () => {
+  it('is a function', function () {
     expect(this.sum).toBeFunction();
   });
-  it('returns a number', () => {
+  it('returns a number', function () {
     expect(this.sum(1, 2)).toBeNumber();
   });
-  it('add numbers correctly', () => {
+  it('add numbers correctly', function () {
     expect(this.sum(1, 2)).toEqual(3);
   });
 });
diff --git a/examples/jest/src/sum.spec.js b/examples/jest/src/sum.spec.js
index 4ba9c74..034be26 100644
--- a/examples/jest/src/sum.spec.js
+++ b/examples/jest/src/sum.spec.js
@@ -1,14 +1,14 @@
-describe('sum(a, b)', () => {
-  beforeEach(() => {
+describe('sum(a, b)', function () {
+  beforeEach(function () {
     this.sum = require('./sum');
   });
-  it('is a function', () => {
+  it('is a function', function () {
     expect(this.sum).toBeFunction();
   });
-  it('returns a number', () => {
+  it('returns a number', function () {
     expect(this.sum(1, 2)).toBeNumber();
   });
-  it('add numbers correctly', () => {
+  it('add numbers correctly', function () {
     expect(this.sum(1, 2)).toEqual(3);
   });
 });
diff --git a/test/toHaveUndefined.spec.js b/test/toHaveUndefined.spec.js
index 5303ea8..ab4aa14 100644
--- a/test/toHaveUndefined.spec.js
+++ b/test/toHaveUndefined.spec.js
@@ -4,13 +4,13 @@ var describeToHaveX = require('./lib/describeToHaveX');
 // spec
 describe('toHaveUndefined', function () {
   describeToHaveX('toHaveUndefined', function () {
-    describe('when subject does NOT have a member at the given key', () => {
+    describe('when subject does NOT have a member at the given key', function () {
       it('should deny', function () {
         expect({}).not.toHaveUndefined('memberName');
         expect(null).not.toHaveUndefined('memberName');
       });
     });
-    describe('when subject DOES have a member at the given key', () => {
+    describe('when subject DOES have a member at the given key', function () {
       describe('when subject IS undefined', function () {
         it('should confirm', function () {
           expect({