diff --git a/MANIFEST.in b/MANIFEST.in
index bc7b95d1e..2ff23e019 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -9,3 +9,5 @@ include *.c
 recursive-exclude Tests *
 recursive-include docs *.txt
 recursive-include libImaging *.c *.h
+recursive-include Tk *.c *.txt
+recursive-include Sane *.c *.txt