diff --git a/core/lib/Drupal/Core/Database/Database.php b/core/lib/Drupal/Core/Database/Database.php
index 55f3501..009cef9 100644
--- a/core/lib/Drupal/Core/Database/Database.php
+++ b/core/lib/Drupal/Core/Database/Database.php
@@ -449,11 +449,13 @@ public static function ignoreTarget($key, $target) {
    *
    * @param string $url
    *   The URL.
+   * @param string $root
+   *   The root directory of the Drupal installation.
    *
    * @return array
    *   The database connection info.
    */
-  public static function convertDbUrlToConnectionInfo($url) {
+  public static function convertDbUrlToConnectionInfo($url, $root) {
     $info = parse_url($url);
     if (!isset($info['scheme'], $info['host'], $info['path'])) {
       throw new \InvalidArgumentException('Invalid --dburl. Minimum requirement: driver://host/database.');
@@ -467,7 +469,7 @@ public static function convertDbUrlToConnectionInfo($url) {
       $info['path'] = substr($info['path'], 1);
     }
     if ($info['scheme'] === 'sqlite' && $info['path'][0] !== '/') {
-      $info['path'] = DRUPAL_ROOT . '/' . $info['path'];
+      $info['path'] = $root . '/' . $info['path'];
     }
     $database = array(
       'driver' => $info['scheme'],
diff --git a/core/modules/simpletest/src/BrowserTestBase.php b/core/modules/simpletest/src/BrowserTestBase.php
index c8aa69b..c0cd5fe 100644
--- a/core/modules/simpletest/src/BrowserTestBase.php
+++ b/core/modules/simpletest/src/BrowserTestBase.php
@@ -1064,7 +1064,7 @@ private function changeDatabasePrefix() {
     // If the test is run with argument dburl then use it.
     $db_url = getenv('SIMPLETEST_DB');
     if (!empty($db_url)) {
-      $database = Database::convertDbUrlToConnectionInfo($db_url);
+      $database = Database::convertDbUrlToConnectionInfo($db_url, DRUPAL_ROOT);
       Database::addConnectionInfo('default', 'default', $database);
     }
 
diff --git a/core/scripts/run-tests.sh b/core/scripts/run-tests.sh
index 209e237..5f4d35a 100644
--- a/core/scripts/run-tests.sh
+++ b/core/scripts/run-tests.sh
@@ -414,7 +414,7 @@ function simpletest_script_setup_database($new = FALSE) {
     // Remove a possibly existing default connection (from settings.php).
     Database::removeConnection('default');
     try {
-      $databases['default']['default'] = Database::convertDbUrlToConnectionInfo($args['dburl']);
+      $databases['default']['default'] = Database::convertDbUrlToConnectionInfo($args['dburl'], DRUPAL_ROOT);
     }
     catch (\InvalidArgumentException $e) {
       simpletest_script_print_error('Invalid --dburl. Reason: ' . $e->getMessage());