diff --git a/MANIFEST.in b/MANIFEST.in
index 4ea9887..ba1fae8 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,5 +1,5 @@
 include MANIFEST.in
-include *.c
 include *.txt
+recursive-include src *.c
 recursive-include samples *.py
 recursive-include test *.py *.sql