diff --git a/microgen/box_mesh.py b/microgen/box_mesh.py
index 8d479393..9c6ce312 100644
--- a/microgen/box_mesh.py
+++ b/microgen/box_mesh.py
@@ -25,8 +25,7 @@
 #     USE_MULTI_RAY = True
 # except ImportError:
 
-USE_MULTI_RAY = False
-
+USE_MULTI_RAY = True
 
 class ClosestCellsOnBoundaries(NamedTuple):
     """