diff --git a/openmc/cell.py b/openmc/cell.py
index fe8b4a52cd..e8b9033a96 100644
--- a/openmc/cell.py
+++ b/openmc/cell.py
@@ -427,9 +427,8 @@ class Cell(object):
         else:
             if self.volume_information is not None:
                 volume = self.volume_information['volume'][0]
-                for full_name, atoms in self.volume_information['atoms']:
-                    name, xs = full_name.split('.')
-                    nuclide = openmc.Nuclide(name, xs)
+                for name, atoms in self.volume_information['atoms']:
+                    nuclide = openmc.Nuclide(name)
                     density = 1.0e-24 * atoms[0]/volume  # density in atoms/b-cm
                     nuclides[name] = (nuclide, density)
             else: