diff --git a/rmgpy/molecule/fragment.py b/rmgpy/molecule/fragment.py
index e0c48eea0c..6e5c10652c 100644
--- a/rmgpy/molecule/fragment.py
+++ b/rmgpy/molecule/fragment.py
@@ -391,7 +391,7 @@ def is_radical(self):
                 return True
         return False
 
-    def update(self, log_species=True, sort_atoms=True):
+    def update(self, log_species=False, sort_atoms=False, raise_atomtype_exception=False):
         # currently sort_atoms does not work for fragments
         for v in self.vertices:
             if not isinstance(v, CuttingLabel):