diff --git a/openmc/material.py b/openmc/material.py
index 28d38cb900..bdc25b280a 100644
--- a/openmc/material.py
+++ b/openmc/material.py
@@ -144,7 +144,7 @@ class Material(IDManagerMixin):
         string += f' [{self._density_units}]\n'
 
         string += '{: <16}=\t{}'.format('\tVolume', self._volume)
-        string += ' [cm3]\n'
+        string += ' [cm^3]\n'
 
         string += '{: <16}\n'.format('\tS(a,b) Tables')