diff --git a/openmc/cross.py b/openmc/arithmetic.py
similarity index 100%
rename from openmc/cross.py
rename to openmc/arithmetic.py
diff --git a/openmc/tallies.py b/openmc/tallies.py
index fb07532a0e..3c4d99c730 100644
--- a/openmc/tallies.py
+++ b/openmc/tallies.py
@@ -12,7 +12,7 @@ import sys
 import numpy as np
 
 from openmc import Mesh, Filter, Trigger, Nuclide
-from openmc.cross import *
+from openmc.arithmetic import *
 from openmc.filter import _FILTER_TYPES
 import openmc.checkvalue as cv
 from openmc.clean_xml import *