diff --git a/interfaces/cython/cantera/test/test_reactor.py b/interfaces/cython/cantera/test/test_reactor.py
index 76e5bae3f..75cdacac8 100644
--- a/interfaces/cython/cantera/test/test_reactor.py
+++ b/interfaces/cython/cantera/test/test_reactor.py
@@ -154,7 +154,7 @@ class TestReactor(utilities.CanteraTest):
 
         self.net.advance(10.0)
         self.assertNear(self.net.time, 10.0)
-        self.assertNear(self.r1.T, self.r2.T)
+        self.assertNear(self.r1.T, self.r2.T, 1e-7)
         self.assertNotAlmostEqual(self.r1.thermo.P, self.r2.thermo.P)
 
     def test_heatTransfer2(self):
@@ -471,8 +471,8 @@ class TestFlowReactor(utilities.CanteraTest):
 
         net = ct.ReactorNet()
         net.addReactor(r)
-        net.atol = 1e-16
-        net.rtol = 1e-10
+        net.atol = 1e-18
+        net.rtol = 1e-9
 
         t = 0
         self.assertNear(r.speed, 10 / r.density)