diff --git a/core/tests/bootstrap.php b/core/tests/bootstrap.php
index 1a57d9e..f2358ff 100644
--- a/core/tests/bootstrap.php
+++ b/core/tests/bootstrap.php
@@ -33,7 +33,8 @@ function _drupal_phpunit_scan_autoload_directories($loader, $given_path) {
         _drupal_phpunit_scan_autoload_directories($loader, $child_path);
         // Check if it's a module second.
         $lib_path = $child_path . '/lib';
-        if (is_dir($lib_path)) {
+        $info_yml = $child_path . "/$item.info.yml";
+        if (is_dir($lib_path) && is_file($info_yml)) {
           $loader->add('Drupal\\' . $item, $lib_path);
         }
       }