diff --git a/setup.cfg b/setup.cfg
index fe8cd81e5b..66e865572e 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -30,7 +30,7 @@ keywords =
     ugrid
     visualisation
 license = LGPL-3.0-or-later
-license_file = COPYING.LESSER
+license_files = COPYING.LESSER
 long_description = file: README.md
 long_description_content_type = text/markdown
 name = scitools-iris