diff --git a/MANIFEST.in b/MANIFEST.in
index bea6fd9bb..3bd657b87 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,6 +1,6 @@
 include README.rst
 include CHANGES.rst
-include CONTRIBUTING.rst
+include CONTRIBUTING.md
 include linter_plugin.py
 include letsencrypt/EULA
 recursive-include letsencrypt *.json