diff --git a/MANIFEST.in b/MANIFEST.in
index 8b0a989..ec99a93 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,6 +1,6 @@
 include README.md setup.py
 include deeptoolsintervals/tree.*
-exclude deeptoolsintervals/tree/*.c
-exclude deeptoolsintervals/tree/*.h
-exclude deeptoolsintervals/*.py
+include deeptoolsintervals/tree/*.c
+include deeptoolsintervals/tree/*.h
+include deeptoolsintervals/*.py
 include deeptoolsintervals/test/*