diff --git a/tests/Browser/BrowserTestCase.php b/tests/Browser/BrowserTestCase.php
index 68a6ddc1b..2c8e94864 100644
--- a/tests/Browser/BrowserTestCase.php
+++ b/tests/Browser/BrowserTestCase.php
@@ -33,7 +33,7 @@ abstract class BrowserTestCase extends TestCase
      * test. In most cases you probably wont need to do this, or can modify the test slightly to
      * avoid the need to do so.
      */
-    public static function setUpBeforeClass()
+    public static function setUpBeforeClass(): void
     {
         parent::setUpBeforeClass();