diff --git a/tests/flow/test_Richards.py b/tests/flow/test_Richards.py
index 6579370d..d63a6210 100644
--- a/tests/flow/test_Richards.py
+++ b/tests/flow/test_Richards.py
@@ -12,6 +12,8 @@ except Exception, e:
 
 TOL = 1E-8
 
+np.random.seed(0)
+
 class TestModels(unittest.TestCase):
 
     def test_BaseHaverkamp_Theta(self):