diff --git a/core/modules/file/tests/src/FunctionalJavascript/FileManagedStateTest.php b/core/modules/file/tests/src/FunctionalJavascript/FileManagedStateTest.php
index d81d325876..c692f73926 100644
--- a/core/modules/file/tests/src/FunctionalJavascript/FileManagedStateTest.php
+++ b/core/modules/file/tests/src/FunctionalJavascript/FileManagedStateTest.php
@@ -16,7 +16,7 @@ class FileManagedStateTest extends WebDriverTestBase {
    *
    * @var array
    */
-  public static $modules = ['file_test_states', 'file'];
+  protected static $modules = ['file_test_states', 'file'];
 
   /**
    * Tests if managed file is correctly hidden with states.