diff --git a/interfaces/cython/cantera/thermo.pyx b/interfaces/cython/cantera/thermo.pyx
index 96d2b7911..5bd0363b8 100644
--- a/interfaces/cython/cantera/thermo.pyx
+++ b/interfaces/cython/cantera/thermo.pyx
@@ -167,6 +167,8 @@ cdef class Species:
             data = GasTransportData(init=False)
             data._assign(self.species.transport)
             return data
+        def __set__(self, GasTransportData tran):
+            self.species.transport = tran._data
 
 
 cdef class ThermoPhase(_SolutionBase):