diff --git a/src/test/java/uk/org/ukfederation/mda/dom/saml/AttributeMakerTest.java b/src/test/java/uk/org/ukfederation/mda/dom/saml/AttributeMakerTest.java
index 06adcb1..3cead68 100644
--- a/src/test/java/uk/org/ukfederation/mda/dom/saml/AttributeMakerTest.java
+++ b/src/test/java/uk/org/ukfederation/mda/dom/saml/AttributeMakerTest.java
@@ -42,5 +42,8 @@ public void apply() {
             final Node node = attrs.item(i);
             Assert.assertNotNull(node.getLocalName());
         }
+        
+        // check that the prefix is declared properly
+        Assert.assertEquals(newElement.lookupNamespaceURI(SAMLSupport.SAML_PREFIX), SAMLSupport.SAML_NS);
     }
 }