diff --git a/tests/OpenGraphTests.php b/tests/OpenGraphTests.php
index <HASH>..<HASH> 100644
--- a/tests/OpenGraphTests.php
+++ b/tests/OpenGraphTests.php
@@ -6,7 +6,10 @@ if (!class_exists('\PHPUnit\Framework\TestCase')) {
     class_alias('\PHPUnit_Framework_TestCase', '\PHPUnit\Framework\TestCase');
 }
 
-class OpenGraphTest extends PHPUnit_Framework_TestCase
+/**
+ * Class OpenGraphTest for tests with PHPUnit.
+ */
+class OpenGraphTest extends PHPUnit_Framework_TestCase \PHPUnit\Framework\TestCase
 {
     
     /**
Updated class for PHPUnit 6