diff --git a/diffsims/utils/discretise_utils.py b/diffsims/utils/discretise_utils.py
index 4becb7af..42a0159a 100644
--- a/diffsims/utils/discretise_utils.py
+++ b/diffsims/utils/discretise_utils.py
@@ -1903,11 +1903,11 @@ def get_discretisation(
     "Ne",
     "Na",
     "Mg",
-    "A1",
+    "Al",
     "Si",
     "P",
     "S",
-    "CI",
+    "Cl",
     "Ar",
     "K",
     "Ca",
@@ -1971,7 +1971,7 @@ def get_discretisation(
     "Pt",
     "Au",
     "Hg",
-    "T1",
+    "Tl",
     "Pb",
     "Bi",
     "Po",