diff --git a/MANIFEST.in b/MANIFEST.in
index ec92a80..312233a 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -2,4 +2,7 @@ include LICENSE
 include MANIFEST.in
 include README.md
 include setup.py
-recursive-include extern/nlopt
+include setup.cfg
+include extensions.py
+include CMakeLists.txt
+recursive-include extern/nlopt *