diff --git a/setup.cfg b/setup.cfg
index 0e6ff0f..123fdc2 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -7,7 +7,7 @@ url = https://github.com/tox-dev/py-filelock
 author = Benedikt Schmitt
 author_email = benedikt@benediktschmitt.de
 license = Unlicense
-license_file = LICENSE
+license_files = LICENSE
 classifiers =
     Development Status :: 5 - Production/Stable
     Intended Audience :: Developers