1 files changed, 1 insertions, 1 deletions
diff --git a/core/tests/Drupal/FunctionalTests/FolderTest.php b/core/tests/Drupal/FunctionalTests/FolderTest.php
index 131d1c0c053..1f1674306a6 100644
--- a/core/tests/Drupal/FunctionalTests/FolderTest.php
+++ b/core/tests/Drupal/FunctionalTests/FolderTest.php
@@ -27,7 +27,7 @@ class FolderTest extends BrowserTestBase {
    */
   protected $defaultTheme = 'stark';
 
-  public function testFolderSetup() {
+  public function testFolderSetup(): void {
     $directory = 'public://styles';
     $this->assertTrue(\Drupal::service('file_system')->prepareDirectory($directory, FALSE), 'Directory created.');
   }