diff --git a/MANIFEST.in b/MANIFEST.in
index 80b15c4..8ccc23c 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -5,3 +5,4 @@ recursive-include files *
 recursive-include milters *
 recursive-include tests *
 recursive-include doc *
+recursive-include alembic *