diff --git a/testing/web-platform/tests/tools/ci/tc/decision.py b/testing/web-platform/tests/tools/ci/tc/decision.py
index 2dedbb125626..0b9df1a90bd0 100644
--- a/testing/web-platform/tests/tools/ci/tc/decision.py
+++ b/testing/web-platform/tests/tools/ci/tc/decision.py
@@ -105,9 +105,9 @@ def filter_jobs(jobs, event):
 
     # Exclude browser stability tests for exports from that specific browser.
     try:
-        if event["sender"]["login"] == "chromium-wpt-export-bot":
+        if event["pull_request"]["user"]["login"] == "chromium-wpt-export-bot":
             jobs.discard("wpt-chrome-dev-stability")
-        if event["sender"]["login"] == "moz-wptsync-bot":
+        if event["pull_request"]["user"]["login"] == "moz-wptsync-bot":
             jobs.discard("wpt-firefox-nightly-stability")
     except KeyError:
         # Just continue if the username cannot be pulled from the event.