diff --git a/setup.cfg b/setup.cfg
index b880b5d9c..c8b3a81b2 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -4,4 +4,4 @@ testpaths = tests/
 addopts = --assert=plain --cov=gunicorn --cov-report=xml
 
 [metadata]
-license_file = LICENSE
+license_files = ['LICENSE']