diff --git a/brozzler/worker.py b/brozzler/worker.py
index 0f866f1..78bdb6a 100644
--- a/brozzler/worker.py
+++ b/brozzler/worker.py
@@ -335,7 +335,7 @@ class BrozzlerWorker:
         # see https://docs.python-requests.org/en/latest/user/advanced/#body-content-workflow
         try:
             with requests.get(
-                page.url, stream=True, verify=False, timeout=HEADER_REQUEST_TIMEOUT
+                page.url, stream=True, verify=False, timeout=self.HEADER_REQUEST_TIMEOUT
             ) as r:
                 return r.headers
         except requests.exceptions.Timeout as e: