diff --git a/tests/core/test_e2e.py b/tests/core/test_e2e.py
index 6cc8c18e..44fab965 100644
--- a/tests/core/test_e2e.py
+++ b/tests/core/test_e2e.py
@@ -76,7 +76,7 @@ def wait_for_worker():
     def test_file_system_queue(self, tmp_path, scheme):
         config = Config(
             local_cache_root=tmp_path,
-            rag=dict(queue_url=f"{scheme}{tmp_path / 'queue'}"),
+            rag=dict(queue_url=f"{scheme}{(tmp_path / 'queue').as_posix()}"),
         )
 
         with self.worker(config=config):