diff --git a/MANIFEST.in b/MANIFEST.in
index 792fbdb..9fc7449 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -2,3 +2,5 @@ include README.rst
 include LICENSE.txt
 include tox.ini
 recursive-include tests *
+recursive-exclude * __pycache__
+recursive-exclude * *.py[co]