diff --git a/config.project b/config.project
index 6016ba0..d22e3ad 100644
--- a/config.project
+++ b/config.project
@@ -1,6 +1,7 @@
 # project
 mb_package=
 mb_require_out_of_tree=no
+mb_require_source_dir=yes
 mb_custom_install_headers=no
 mb_avoid_version=no