diff --git a/tests/TestCase.php b/tests/TestCase.php
index 001ccfb..eb0b111 100644
--- a/tests/TestCase.php
+++ b/tests/TestCase.php
@@ -13,6 +13,6 @@
 
 namespace Eventum\RPC\Test;
 
-class TestCase extends \PHPUnit\Framework\TestCase
+abstract class TestCase extends \PHPUnit\Framework\TestCase
 {
 }