diff --git a/tests/unit/web/twig/ExtensionTest.php b/tests/unit/web/twig/ExtensionTest.php
index 96c26e8d4fa..783be3260e3 100644
--- a/tests/unit/web/twig/ExtensionTest.php
+++ b/tests/unit/web/twig/ExtensionTest.php
@@ -979,7 +979,8 @@ public function testCloneFunction(): void
      */
     public function testDataUrlFunction(): void
     {
-        $path = dirname(__DIR__, 4) . '/.github/workflows/ci.yml';
+        Craft::setAlias('@root', dirname(__DIR__, 4));
+        $path = '@root/.github/workflows/ci.yml';
         $dataUrl = $this->view->renderString('{{ dataUrl(path) }}', compact('path'));
         self::assertStringStartsWith('data:application/x-yaml;base64,', $dataUrl);
     }