diff --git a/MANIFEST.in b/MANIFEST.in
index 7ed82596..27356de4 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,6 +1,6 @@
-include *.rst
 include *.txt
-recursive-include cf_units *.py
+include *.md
+recursive-include cf_units *.py *.py *.pxd *.pyx
 include cf_units/etc/site.cfg.template
 include CHANGES COPYING COPYING.LESSER INSTALL
 include versioneer.py