diff --git a/interfaces/cython/cantera/test/test_transport.py b/interfaces/cython/cantera/test/test_transport.py
index 26d767a92..b59e26768 100644
--- a/interfaces/cython/cantera/test/test_transport.py
+++ b/interfaces/cython/cantera/test/test_transport.py
@@ -8,7 +8,7 @@ import copy
 class TestTransport(utilities.CanteraTest):
     def setUp(self):
         self.phase = ct.Solution("h2o2.yaml")
-        self.phase.X = [0.1, 1e-4, 1e-5, 0.2, 2e-4, 0.3, 1e-6, 5e-5, 0.0, 0.4]
+        self.phase.X = [0.1, 1e-4, 1e-5, 0.2, 2e-4, 0.3, 1e-6, 5e-5, 1e-6, 0.4]
         self.phase.TP = 800, 2*ct.one_atm
 
     def test_scalar_properties(self):