diff --git a/pyproject.toml b/pyproject.toml
index 8d0df499..b692afcd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -65,6 +65,7 @@ requires = [
 
 [tool.setuptools]
 dynamic.version.attr = "cpymad.__version__"
-packages.find = {where = ["src"], include = ["cpymad*"]}
-include-package-data = false
+packages = ["cpymad", "cpymad.COPYING"]
+package-dir = {"cpymad" = "src"}
 package-data = {"cpymad.COPYING" = ["*.rst"]}
+include-package-data = false