diff --git a/core/tests/Drupal/KernelTests/FileSystemModuleDiscoveryDataProviderTrait.php b/core/tests/Drupal/KernelTests/FileSystemModuleDiscoveryDataProviderTrait.php
index 02d63841e22ae272625ddeddcc72c44f59918498..c955289fcfc79aa09865d726dc77b3df37c00d6b 100644
--- a/core/tests/Drupal/KernelTests/FileSystemModuleDiscoveryDataProviderTrait.php
+++ b/core/tests/Drupal/KernelTests/FileSystemModuleDiscoveryDataProviderTrait.php
@@ -14,9 +14,10 @@ trait FileSystemModuleDiscoveryDataProviderTrait {
    *   An array of module names to test.
    */
   public function coreModuleListDataProvider() {
-    $module_dirs = array_keys(iterator_to_array(new \FilesystemIterator(__DIR__ . '/../../../modules/')));
-    $module_names = array_map(function ($path) {
-      return str_replace(__DIR__ . '/../../../modules/', '', $path);
+    $prefix = dirname(__DIR__, 3) . DIRECTORY_SEPARATOR . 'modules';
+    $module_dirs = array_keys(iterator_to_array(new \FilesystemIterator($prefix)));
+    $module_names = array_map(function ($path) use ($prefix) {
+      return str_replace($prefix . DIRECTORY_SEPARATOR, '', $path);
     }, $module_dirs);
     $modules_keyed = array_combine($module_names, $module_names);