diff --git a/core/tests/Drupal/Tests/Core/Discovery/TemplateDiscoveryTest.php b/core/tests/Drupal/Tests/Core/Discovery/TemplateDiscoveryTest.php
index f9a1c54..2a4feea 100644
--- a/core/tests/Drupal/Tests/Core/Discovery/TemplateDiscoveryTest.php
+++ b/core/tests/Drupal/Tests/Core/Discovery/TemplateDiscoveryTest.php
@@ -75,7 +75,7 @@ public function testExtensionProviderSpecialCase() {
     $this->assertArrayHasKey('id', $definition);
     $this->assertEquals('my_module.template', $definition['id']);
     $this->assertArrayHasKey('_discovered_file_path', $definition);
-    $this->assertEquals('root/modules/special_provider/my_sub_dir/my_module.template.html.twig', $definition['_discovered_file_path']);
+    $this->assertEquals('vfs://root/modules/special_provider/my_sub_dir/my_module.template.html.twig', $definition['_discovered_file_path']);
   }
 
   /**