diff --git a/example/Vector/3_molecular_dynamic/config.cfg b/example/Vector/3_molecular_dynamic/config.cfg
index 1eecbac3577c765edca7f90cf5f61cfb6b9f4880..5ce0ebb452c5db2263236e650fe2335b7db89535 100644
--- a/example/Vector/3_molecular_dynamic/config.cfg
+++ b/example/Vector/3_molecular_dynamic/config.cfg
@@ -1,2 +1,2 @@
 [pack]
-files = main.cpp Makefile
+files = main.cpp main_expr.cpp Makefile