diff --git a/src/agents/tools/pdf-tool.test.ts b/src/agents/tools/pdf-tool.test.ts
index 8fc8f1bc57a2..f32ccee457cd 100644
--- a/src/agents/tools/pdf-tool.test.ts
+++ b/src/agents/tools/pdf-tool.test.ts
@@ -7,6 +7,7 @@ import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
 import type { OpenClawConfig } from "../../config/config.js";
 import * as pdfExtractModule from "../../media/pdf-extract.js";
 import * as webMedia from "../../media/web-media.js";
+import { withEnvAsync } from "../../test-utils/env.js";
 import * as modelDiscovery from "../agent-model-discovery.js";
 import type { AuthProfileStore } from "../auth-profiles/types.js";
 import * as modelAuth from "../model-auth.js";
@@ -168,9 +169,10 @@ async function withManagedInboundPdf(
   const mediaPath = path.join(inboundDir, mediaId);
   await fs.mkdir(inboundDir, { recursive: true });
   await fs.writeFile(mediaPath, FAKE_PDF_MEDIA.buffer);
-  vi.stubEnv("OPENCLAW_STATE_DIR", stateDir);
   try {
-    await run({ stateDir, mediaId, mediaPath });
+    await withEnvAsync({ OPENCLAW_STATE_DIR: stateDir }, async () => {
+      await run({ stateDir, mediaId, mediaPath });
+    });
   } finally {
     await fs.rm(stateDir, { recursive: true, force: true });
   }
@@ -186,7 +188,6 @@ describe("createPdfTool", () => {
 
   afterEach(() => {
     vi.restoreAllMocks();
-    vi.unstubAllEnvs();
     global.fetch = priorFetch;
   });