diff --git a/pep-0554.rst b/pep-0554.rst
index 2660a67e2a0d..91e28911bebe 100644
--- a/pep-0554.rst
+++ b/pep-0554.rst
@@ -1678,10 +1678,6 @@ References
 .. [benefits]
    https://mail.python.org/pipermail/python-ideas/2017-September/047122.html
 
-.. [main-thread]
-   https://mail.python.org/pipermail/python-ideas/2017-September/047144.html
-   https://mail.python.org/pipermail/python-dev/2017-September/149566.html
-
 .. [reset_globals]
    https://mail.python.org/pipermail/python-dev/2017-September/149545.html