diff --git a/MindSPONGE/mindsponge/md/__init__.py b/MindSPONGE/mindsponge/md/__init__.py
index b2d8c553adfff55b2095c98c36bd9470b5f7d213..46ded7a1be99a775c6dbf30c52dca4d085763ebd 100644
--- a/MindSPONGE/mindsponge/md/__init__.py
+++ b/MindSPONGE/mindsponge/md/__init__.py
@@ -33,7 +33,6 @@ from . import potential
 from . import control
 from . import space
 from . import partition
-from .functions import *
 from .potential import *
 from .control import *
 from .space import *