diff --git a/buildkite/bazel-central-registry/bcr_presubmit.py b/buildkite/bazel-central-registry/bcr_presubmit.py
index 60289d2..a413ec0 100755
--- a/buildkite/bazel-central-registry/bcr_presubmit.py
+++ b/buildkite/bazel-central-registry/bcr_presubmit.py
@@ -171,7 +171,8 @@
 
 
 def download(url, file):
-    with urllib.request.urlopen(url) as response:
+    req = urllib.request.Request(url, headers={'User-Agent': 'Mozilla/5.0'})
+    with urllib.request.urlopen(req) as response:
         with open(file, "wb") as f:
             f.write(response.read())