diff --git a/package/MDAnalysis/guesser/default_guesser.py b/package/MDAnalysis/guesser/default_guesser.py
index 2ecc64c1e66..673a7ca7e54 100644
--- a/package/MDAnalysis/guesser/default_guesser.py
+++ b/package/MDAnalysis/guesser/default_guesser.py
@@ -352,6 +352,8 @@ def guess_atom_element(self, atomname):
 
             # just in case
             if name in tables.atomelements:
+                if name == "CS" and  isinstance(eval(atomname[1:-1]), int): #"Adding these two lines correctly assigns this C*S atoms as carbons"
+                    name = "AC"  # AC maps to C in the elements table
                 return tables.atomelements[name]
 
             while name: