diff --git a/docs/source/conf.py b/docs/source/conf.py
index 9b051fb0..acbd1226 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -175,6 +175,14 @@
 linkcheck_ignore = [
     "https://pubs.acs.org/doi/*",  # Checking dois is forbidden here
 ]
+# Spoof user agent to avoid 403 errors, see
+# https://github.com/sphinx-doc/sphinx/issues/10343#issuecomment-1097430133
+linkcheck_request_headers = {
+    r"https://opensource.org/license/bsd-3-clause/": {
+        "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:92.0) "
+        "Gecko/20100101 Firefox/92.0"
+    }
+}
 
 myst_url_schemes = {
     "http": None,