diff --git a/tests/rpfba/test_rpFBA.py b/tests/rpfba/test_rpFBA.py
index 4b2e47a..b9096bb 100644
--- a/tests/rpfba/test_rpFBA.py
+++ b/tests/rpfba/test_rpFBA.py
@@ -59,7 +59,7 @@ def _format_dict(old, new={}):
             compartment_id="c",
             biomass_rxn_id="biomass",
             objective_rxn_id="rxn_target",
-            ignore_orphan_species=True,
+            with_orphan_species=False,
             sim="fraction",
             fraction_of=0.75,
             merge=""