diff --git a/setup.cfg b/setup.cfg
index 3d60382d..7d9424d0 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -18,13 +18,19 @@ project_urls =
     Documentation = https://importlib-resources.readthedocs.io/
 
 [options]
-packages = find:
+packages = find_namespace:
 include_package_data = true
 python_requires = >=3.6
 install_requires =
     zipp >= 0.4; python_version < '3.8'
 setup_requires = setuptools_scm[toml] >= 3.4.1
 
+[options.packages.find]
+exclude =
+        build*
+        docs*
+        tests*
+
 [options.extras_require]
 testing =
 	# upstream