diff --git a/data/inputs/ohn.cti b/data/inputs/ohn.cti
index ace7666b9..565d329b8 100644
--- a/data/inputs/ohn.cti
+++ b/data/inputs/ohn.cti
@@ -7,7 +7,8 @@ ideal_gas(name = "gas",
           transport = 'Mix',
           reactions = 'gri30: all',
           options = ['skip_undeclared_elements',
-                     'skip_undeclared_species'],
+                     'skip_undeclared_species',
+                     'skip_undeclared_third_bodies'],
           initial_state = state(temperature = 300.0, pressure = OneAtm,
                                 mole_fractions = 'H2:2, O2:1, N2:3.76')
           )