diff --git a/tests/unit/system/classes/MediaLibraryTest.php b/tests/unit/system/classes/MediaLibraryTest.php
index 701d23401..54c4a6a3e 100644
--- a/tests/unit/system/classes/MediaLibraryTest.php
+++ b/tests/unit/system/classes/MediaLibraryTest.php
@@ -4,7 +4,7 @@ use System\Classes\MediaLibrary;
 
 class MediaLibraryTest extends TestCase // @codingStandardsIgnoreLine
 {
-    protected function tearDown()
+    protected function tearDown() : void
     {
         $this->removeMedia();
         parent::tearDown();