diff --git a/openmc/deplete/results_list.py b/openmc/deplete/results_list.py
index 9e7cd9ffb9..eee214d8ff 100644
--- a/openmc/deplete/results_list.py
+++ b/openmc/deplete/results_list.py
@@ -57,7 +57,7 @@ class ResultsList(list):
             Material name to evaluate
         nuc : str
             Nuclide name to evaluate
-        nuc_units : {"atoms", "atoms/b/cm", "atoms/cm^3"}, optional
+        nuc_units : {"atoms", "atom/b-cm", "atom/cm3"}, optional
             Units for the returned concentration. Default is ``"atoms"``
         time_units : {"s", "d"}, optional
             Units for the returned time array. Default is ``"s"`` to
@@ -73,7 +73,7 @@ class ResultsList(list):
         """
         check_value("time_units", time_units, {"s", "d"})
         check_value("nuc_units", nuc_units,
-                    {"atoms", "atoms/b/cm", "atoms/cm^3"})
+                    {"atoms", "atom/b-cm", "atom/cm3"})
 
         time = np.empty_like(self, dtype=float)
         concentration = np.empty_like(self, dtype=float)
@@ -90,7 +90,7 @@ class ResultsList(list):
         if nuc_units != "atoms":
             # Divide by volume to get density
             concentration /= self[0].volume[mat]
-            if nuc_units == "atoms/b/cm":
+            if nuc_units == "atom/b-cm":
                 # 1 barn = 1e-24 cm^2
                 concentration *= 1e-24
 
diff --git a/tests/unit_tests/test_deplete_resultslist.py b/tests/unit_tests/test_deplete_resultslist.py
index f95bc31539..d3609135b3 100644
--- a/tests/unit_tests/test_deplete_resultslist.py
+++ b/tests/unit_tests/test_deplete_resultslist.py
@@ -29,12 +29,12 @@ def test_get_atoms(res):
     # Check alternate units
     volume = res[0].volume["1"]
 
-    t_days, n_cm3 = res.get_atoms("1", "Xe135", nuc_units="atoms/cm^3", time_units="d")
+    t_days, n_cm3 = res.get_atoms("1", "Xe135", nuc_units="atom/cm3", time_units="d")
 
     assert t_days == pytest.approx(t_ref / (60 * 60 * 24))
     assert n_cm3 == pytest.approx(n_ref / volume)
 
-    _t, n_bcm = res.get_atoms("1", "Xe135", nuc_units="atoms/b/cm")
+    _t, n_bcm = res.get_atoms("1", "Xe135", nuc_units="atom/b-cm")
     assert n_bcm == pytest.approx(n_cm3 * 1e-24)