diff --git a/arc/job/adapter.py b/arc/job/adapter.py
index fbef435827..ae700f9f84 100644
--- a/arc/job/adapter.py
+++ b/arc/job/adapter.py
@@ -386,7 +386,7 @@ def determine_job_array_parameters(self):
                 if len(self.species) > 1:
                     self.iterate_by.append('species')
                 if job_type == 'conf_opt':
-                    if self.species is not None and sum(len(species.conformers) for species in self.species) > 10:
+                    if self.species is not None and sum(len(species.conformers) for species in self.species) > 100:
                         self.iterate_by.append('conf_opt')
                         self.number_of_processes += sum([len(species.conformers) for species in self.species])
                 for species in self.species: