diff --git a/interfaces/cython/cantera/test/test_kinetics.py b/interfaces/cython/cantera/test/test_kinetics.py
index dbc9d901c..dc5414551 100644
--- a/interfaces/cython/cantera/test/test_kinetics.py
+++ b/interfaces/cython/cantera/test/test_kinetics.py
@@ -160,36 +160,36 @@ class KineticsRepeatability(utilities.CanteraTest):
 
     def check_rates_composition(self, mech):
         gas = self.setup_gas(mech)
-        gas.TRX = self.T0, self.rho0, self.X0
+        gas.TDX = self.T0, self.rho0, self.X0
         w1 = gas.net_production_rates
 
         # change everything to guarantee recomputation of rates
-        gas.TRX = self.T1, self.rho1, self.X1
+        gas.TDX = self.T1, self.rho1, self.X1
         w2 = gas.net_production_rates
 
-        gas.TRX = self.T0, self.rho0, self.X1
+        gas.TDX = self.T0, self.rho0, self.X1
         w3 = gas.net_production_rates
 
         # change only composition, and make sure the rates match
-        gas.TRX = self.T0, self.rho0, self.X0
+        gas.TDX = self.T0, self.rho0, self.X0
         w4 = gas.net_production_rates
 
         self.assertArrayNear(w1, w4)
 
     def check_rates_temperature1(self, mech):
         gas = self.setup_gas(mech)
-        gas.TRX = self.T0, self.rho0, self.X0
+        gas.TDX = self.T0, self.rho0, self.X0
         w1 = gas.net_production_rates
 
         # change everything to guarantee recomputation of rates
-        gas.TRX = self.T1, self.rho1, self.X1
+        gas.TDX = self.T1, self.rho1, self.X1
         w2 = gas.net_production_rates
 
-        gas.TRX = self.T1, self.rho0, self.X0
+        gas.TDX = self.T1, self.rho0, self.X0
         w3 = gas.net_production_rates
 
         # change only temperature, and make sure the rates match
-        gas.TRX = self.T0, self.rho0, self.X0
+        gas.TDX = self.T0, self.rho0, self.X0
         w4 = gas.net_production_rates
 
         self.assertArrayNear(w1, w4)
diff --git a/interfaces/cython/cantera/test/test_thermo.py b/interfaces/cython/cantera/test/test_thermo.py
index 3f8d614b3..bb207cb78 100644
--- a/interfaces/cython/cantera/test/test_thermo.py
+++ b/interfaces/cython/cantera/test/test_thermo.py
@@ -499,7 +499,7 @@ class TestInterfacePhase(utilities.CanteraTest):
     def setUp(self):
         self.gas = ct.Solution('diamond.xml', 'gas')
         self.solid = ct.Solution('diamond.xml', 'diamond')
-        self.interface = ct.Solution('diamond.xml', 'diamond_100',
+        self.interface = ct.Interface('diamond.xml', 'diamond_100',
                                       (self.gas, self.solid))
 
     def test_properties(self):