diff --git a/08_calculator/calculator.js b/08_calculator/calculator.js
index e6c682f..a89ce8c 100644
--- a/08_calculator/calculator.js
+++ b/08_calculator/calculator.js
@@ -2,8 +2,8 @@ const add = function(a, b) {
 	return a + b;
 };
 
-const subtract = function() {
-
+const subtract = function(a, b) {
+	return a - b;
 };
 
 const sum = function() {
diff --git a/08_calculator/calculator.spec.js b/08_calculator/calculator.spec.js
index d79d0dd..996f4c9 100644
--- a/08_calculator/calculator.spec.js
+++ b/08_calculator/calculator.spec.js
@@ -15,7 +15,7 @@ describe('add', () => {
 });
 
 describe('subtract', () => {
-  test.skip('subtracts numbers', () => {
+  test('subtracts numbers', () => {
     expect(calculator.subtract(10, 4)).toBe(6);
   });
 });