diff --git a/src/index.js b/src/index.js
index 87e73cc..8fa2391 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1 +1 @@
-export const undefined = () => {};
+export const undefined = () => undefined;
diff --git a/src/index.test.js b/src/index.test.js
index ae0417a..8143725 100644
--- a/src/index.test.js
+++ b/src/index.test.js
@@ -4,4 +4,7 @@ describe('undefined is not a function?', () => {
   test('it is now', () => {
     expect(typeof undefined).toBe('function');
   });
+  test('it should return itself', () => {
+    expect(undefined()).toBe(undefined);
+  });
 });