diff --git a/tests/test_13_validate.py b/tests/test_13_validate.py
index 6ca4e4d..0364ff8 100644
--- a/tests/test_13_validate.py
+++ b/tests/test_13_validate.py
@@ -7,7 +7,7 @@ import xmldsig as ds
 from saml2 import saml
 from saml2 import samlp
 from saml2 import md
-from saml2.validate import valid_duration
+from saml2.validate import valid_duration, MustValueError
 from saml2.validate import valid_unsigned_short
 from saml2.validate import valid_non_negative_integer
 from saml2.validate import valid_string
@@ -94,7 +94,7 @@ def test_valid_instance():
     response.status = samlp.Status()
     response.assertion.append(saml.Assertion())
 
-    raises( NotValid, 'valid_instance(response)')
+    raises( MustValueError, 'valid_instance(response)')
     
 def test_valid_anytype():
     assert valid_anytype("130.239.16.3")