diff --git a/web/src/test/auto/headless/engine/loadKeyboardHelper.ts b/web/src/test/auto/headless/engine/loadKeyboardHelper.ts
index 920dd6755c..fa1be9f276 100644
--- a/web/src/test/auto/headless/engine/loadKeyboardHelper.ts
+++ b/web/src/test/auto/headless/engine/loadKeyboardHelper.ts
@@ -5,7 +5,11 @@
 import fs from 'node:fs';
 import { pathToFileURL } from 'node:url';
 
-const KEYMAN_ROOT = process.env['KEYMAN_ROOT'];
+import { fileURLToPath } from 'node:url';
+import { dirname } from 'node:path';
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const KEYMAN_ROOT = process.env['KEYMAN_ROOT'] ?? (__dirname + '/../../../../../../');
 export const coreurl = pathToFileURL(`${KEYMAN_ROOT}/web/build/engine/obj/core-adapter/import/core`).toString();
 
 export function loadKeyboardBlob(filename: string) {