diff --git a/setup.cfg b/setup.cfg
index c68d38aa..0183f50c 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,25 +1,25 @@
 [metadata]
 name = dulwich
 author = Jelmer Vernooij
 author_email = jelmer@jelmer.uk
 home-page = https://www.dulwich.io/
-description-file = README.md
+description = file:README.md
 summary = Python Git Library
 classifiers =
     Development Status :: 4 - Beta
     License :: OSI Approved :: Apache Software License
     Programming Language :: Python :: 2.7
     Programming Language :: Python :: 3.3
     Programming Language :: Python :: 3.4
     Programming Language :: Python :: 3.5
     Programming Language :: Python :: 3.6
     Programming Language :: Python :: Implementation :: CPython
     Programming Language :: Python :: Implementation :: PyPy
     Operating System :: POSIX
     Operating System :: Microsoft :: Windows
     Topic :: Software Development :: Version Control
 keyword = git, vcs
 project_urls =
     Bug Tracker = https://github.com/dulwich/dulwich/issues
 
 [build_ext]