diff --git a/pep-0518.txt b/pep-0518.txt
index 81b7b949d4e..92dadfd34e4 100644
--- a/pep-0518.txt
+++ b/pep-0518.txt
@@ -381,7 +381,7 @@ Sticking with ``setup.cfg``
 There are two issues with ``setup.cfg`` used by setuptools as a general
 format. One is that they are ``.ini`` files which have issues as mentioned
 in the configparser_ discussion above. The other is that the schema for
-that file has never been rigourlessly defined and thus it's unknown which
+that file has never been rigorously defined and thus it's unknown which
 format would be safe to use going forward without potentially confusing
 setuptools installations.