diff --git a/setup.cfg b/setup.cfg
index 28cab378c0..4607c677e9 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -28,7 +28,7 @@ line_length=100
 multi_line_output=4
 skip=migrations,project_template
 known_first_party=wagtail
-known_third_party=willow,modelcluster,taggit,django,unidecode,bs4,pytz,PIL
+default_section=THIRDPARTY
 
 [tool:pytest]
 django_find_project = false