diff --git a/core/modules/system/lib/Drupal/system/Tests/InstallerTest.php b/core/modules/system/lib/Drupal/system/Tests/InstallerTest.php
index 2c4ead8..63b8a49 100644
--- a/core/modules/system/lib/Drupal/system/Tests/InstallerTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/InstallerTest.php
@@ -68,6 +68,10 @@ protected function setUp() {
         NestedArray::setValue($GLOBALS['conf'], array_merge(array($config_base), explode('.', $name)), $value);
       }
     }
+    $settings['settings']['file_public_path'] = (object) array(
+      'value' => $this->public_files_directory,
+      'required' => TRUE,
+    );
     $settings['conf_path'] = (object) array(
       'value' => $this->public_files_directory,
       'required' => TRUE,