diff --git a/tests/SimpleTest.php b/tests/SimpleTest.php
index f22c7fc..9f8944a 100644
--- a/tests/SimpleTest.php
+++ b/tests/SimpleTest.php
@@ -18,7 +18,7 @@ class SimpleTest extends TestCase
         $simple = new Simple();
         $result = $simple->subtract(4, 2);
         // 2 is the right result, therefore I chose not 2.
-        $this->assertEquals(1, $result);
+        $this->assertNotEquals(1, $result);
     }
 
     public function testSubtract()