diff --git a/pyproject.toml b/pyproject.toml
index f24c7280e5..f17efd2c52 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,6 +23,7 @@ classifiers = [
     "Development Status :: 5 - Production/Stable",
     "Environment :: Console",
     "Intended Audience :: Developers",
+    "License :: OSI Approved :: MIT License",  # for compatibility with tooling such as pip-licenses
     "Operating System :: OS Independent",
     "Programming Language :: Python",
     "Programming Language :: Python :: 3.7",