diff --git a/interfaces/cython/cantera/onedim.py b/interfaces/cython/cantera/onedim.py
index aee12cb5bb..3232f4e146 100644
--- a/interfaces/cython/cantera/onedim.py
+++ b/interfaces/cython/cantera/onedim.py
@@ -51,7 +51,7 @@ def other_components(self, domain=None):
         if isinstance(dom, Inlet1D):
             return tuple([e for e in self._other
                           if e not in {'grid', 'lambda', 'eField'}])
-        elif isinstance(dom, IdealGasFlow):
+        elif isinstance(dom, (IdealGasFlow, IonFlow)):
             return self._other
         else:
             return ()