diff --git a/GPy/testing/rv_transformation_tests.py b/GPy/testing/rv_transformation_tests.py
index 3fbb2abd..d9bdeb49 100644
--- a/GPy/testing/rv_transformation_tests.py
+++ b/GPy/testing/rv_transformation_tests.py
@@ -58,7 +58,7 @@ class RVTransformationTestCase(unittest.TestCase):
         # END OF PLOT
         # Check the gradients at a few random points
         for i in range(5):
-            m.theta = theta_s[i]
+            m.theta = i+1.
             self.assertTrue(m.checkgrad(verbose=True))
 
     def test_Logexp(self):