diff --git a/MANIFEST.in b/MANIFEST.in
index 3675a1c..24aca28 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -3,3 +3,4 @@ include README.md
 include CHANGELOG.md
 include requirements/pypi.txt
 graft test
+global-exclude *.py[cod]