diff --git a/test_delayed_request_middleware.py b/test_delayed_request_middleware.py
index 5e968322..5032b1bd 100644
--- a/test_delayed_request_middleware.py
+++ b/test_delayed_request_middleware.py
@@ -37,7 +37,7 @@ def download_func(spider, request):
     spent = time.time() - start
 
     assert results == [request]
-    assert 1 <= spent <= 1.01, spent
+    assert 1 <= spent <= 1.5, spent
 
 
 if __name__ == "__main__":