diff --git a/src/infra/outbound/message-action-runner.test.ts b/src/infra/outbound/message-action-runner.test.ts
index ed1fbf47eb3..6fdec33ab49 100644
--- a/src/infra/outbound/message-action-runner.test.ts
+++ b/src/infra/outbound/message-action-runner.test.ts
@@ -706,7 +706,8 @@ describe("runMessageAction sandboxed media validation", () => {
       if (result.kind !== "send") {
         throw new Error("expected send result");
       }
-      expect(result.sendResult?.mediaUrl).toBe(tmpFile);
+      // runMessageAction normalizes media paths through platform resolution.
+      expect(result.sendResult?.mediaUrl).toBe(path.resolve(tmpFile));
       const hostTmpOutsideOpenClaw = path.join(os.tmpdir(), "outside-openclaw", "test-media.png");
       await expect(
         runMessageAction({