diff --git a/lib/xos-genx/MANIFEST.in b/lib/xos-genx/MANIFEST.in
index f6da5db..a058bb4 100644
--- a/lib/xos-genx/MANIFEST.in
+++ b/lib/xos-genx/MANIFEST.in
@@ -1,2 +1,3 @@
 include xosgenx/targets/*
+include xosgenx/checkers/*
 include xosgenx/jinja2_extensions/*