diff --git a/MANIFEST.in b/MANIFEST.in
index f2d0b51..6313daa 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -7,3 +7,4 @@ include ChangeLog
 include MANIFEST.in
 include man/*
 include test.py
+exclude dkim/*.pyc dkim/tests/*.pyc