diff --git a/mongoengine/base/document.py b/mongoengine/base/document.py
index 43b865ce..3c4bdba2 100644
--- a/mongoengine/base/document.py
+++ b/mongoengine/base/document.py
@@ -181,7 +181,7 @@ class BaseDocument(object):
         """Dictionary-style field access, set a field's value.
         """
         # Ensure that the field exists before settings its value
-        if name not in self._fields:
+        if not self._dynamic and name not in self._fields:
             raise KeyError(name)
         return setattr(self, name, value)
 
diff --git a/tests/document/dynamic.py b/tests/document/dynamic.py
index 6263e68c..bf69cb27 100644
--- a/tests/document/dynamic.py
+++ b/tests/document/dynamic.py
@@ -292,6 +292,44 @@ class DynamicTest(unittest.TestCase):
         person.save()
         self.assertEqual(Person.objects.first().age, 35)
 
+    def test_dynamic_and_embedded_dict_access(self):
+        """Ensure embedded dynamic documents work with dict[] style access"""
+
+        class Address(EmbeddedDocument):
+            city = StringField()
+
+        class Person(DynamicDocument):
+            name = StringField()
+
+        Person.drop_collection()
+
+        Person(name="Ross", address=Address(city="London")).save()
+
+        person = Person.objects.first()
+        person.attrval = "This works"
+
+        person["phone"] = "555-1212" # but this should too
+
+        # Same thing two levels deep
+        person["address"]["city"] = "Lundenne"
+        person.save()
+
+        self.assertEqual(Person.objects.first().address.city, "Lundenne")
+
+        self.assertEqual(Person.objects.first().phone, "555-1212")
+
+        person = Person.objects.first()
+        person.address = Address(city="Londinium")
+        person.save()
+
+        self.assertEqual(Person.objects.first().address.city, "Londinium")
+
+
+        person = Person.objects.first()
+        person["age"] = 35
+        person.save()
+        self.assertEqual(Person.objects.first().age, 35)
+
 
 if __name__ == '__main__':
     unittest.main()