diff --git a/test/test_core.py b/test/test_core.py
index 5feb9f1..b4e1627 100644
--- a/test/test_core.py
+++ b/test/test_core.py
@@ -113,15 +113,27 @@ class TestCore(unittest.TestCase):
         self.assertRaises(exc, sweden.clear)
         self.assertRaises(exc, sweden.pop, 0)
         self.assertRaises(exc, sweden.popitem)
-        self.assertRaises(exc, sweden.__delitem__, 'name')
 
     def test_dict_syntax(self):
         Country = warlock.model_factory(fixture)
         sweden = Country(name='Sweden', population=9379116)
-        self.assertEqual(sweden['name'], 'Sweden')
+
         sweden['name'] = 'Finland'
         self.assertEqual(sweden['name'], 'Finland')
 
+        del sweden['name']
+        self.assertRaises(AttributeError, getattr, sweden, 'name')
+
+    def test_attr_syntax(self):
+        Country = warlock.model_factory(fixture)
+        sweden = Country(name='Sweden', population=9379116)
+
+        sweden.name = 'Finland'
+        self.assertEqual(sweden.name, 'Finland')
+
+        delattr(sweden, 'name')
+        self.assertRaises(AttributeError, getattr, sweden, 'name')
+
     def test_changes(self):
         Country = warlock.model_factory(fixture)
         sweden = Country(name='Sweden', population=9379116)
diff --git a/warlock/core.py b/warlock/core.py
index da662ec..38cb854 100644
--- a/warlock/core.py
+++ b/warlock/core.py
@@ -76,7 +76,18 @@ def model_factory(schema):
             raise InvalidOperation()
 
         def __delitem__(self, key):
-            raise InvalidOperation()
+            mutation = dict(self.items())
+            del mutation[key]
+            try:
+                self.validator(mutation)
+            except ValidationError:
+                msg = "Unable to delete attribute '%s'" % (key)
+                raise InvalidOperation(msg)
+
+            dict.__delitem__(self, key)
+
+        def __delattr__(self, key):
+            self.__delitem__(key)
 
         # NOTE(termie): This is kind of the opposite of what copy usually does
         def copy(self):