diff --git a/app.py b/app.py
index cbceb84..5695456 100644
--- a/app.py
+++ b/app.py
@@ -598,7 +598,8 @@ def _bench_net():
         t0 = time.perf_counter()
         req = _urlreq.Request("https://speed.cloudflare.com/__up",
                               data=payload, method="POST",
-                              headers={"Content-Type": "application/octet-stream"})
+                              headers={"Content-Type": "application/octet-stream",
+                                       "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64)"})
         with _urlreq.urlopen(req, timeout=25) as r:
             r.read()
         dt = max(time.perf_counter() - t0, 1e-6)