diff --git a/djangocassandra/db/backends/cassandra/compiler.py b/djangocassandra/db/backends/cassandra/compiler.py
index 11dd2c1b..fda7892f 100644
--- a/djangocassandra/db/backends/cassandra/compiler.py
+++ b/djangocassandra/db/backends/cassandra/compiler.py
@@ -303,7 +303,7 @@ def fetch(self, low_mark, high_mark):
         if (
             high_mark is not None and
             low_mark is not None and
-            high_mark <= low_mark
+            high_mark < low_mark
         ):
             raise Exception('Can\'t slice query high_mark > low_mark')
 
diff --git a/djangocassandra/db/fields.py b/djangocassandra/db/fields.py
index 4d104b0d..5338a43e 100644
--- a/djangocassandra/db/fields.py
+++ b/djangocassandra/db/fields.py
@@ -91,6 +91,8 @@ def __init__(
         if 'default' not in kwargs:
             kwargs['default'] = uuid.uuid4
 
+        kwargs['max_length'] = 36
+
         super(FieldUUID, self).__init__(
             *args,
             **kwargs
diff --git a/djangocassandra/db/models.py b/djangocassandra/db/models.py
index b7e66e3b..e2eab1db 100644
--- a/djangocassandra/db/models.py
+++ b/djangocassandra/db/models.py
@@ -3,6 +3,9 @@
     Model as DjangoModel,
     Manager
 )
+from django.db.models.fields import (
+    FieldDoesNotExist
+)
 
 from .fields import TokenPartitionKeyField
 from .query import QuerySet
@@ -18,7 +21,12 @@ def denormalize(
     ):
         field_names = origin._meta.get_all_field_names()
         for name in field_names:
-            field = origin._meta.get_field(name)
+            try:
+                field = origin._meta.get_field(name)
+
+            except FieldDoesNotExist:
+                pass
+
             setattr(
                 destination,
                 field.name,
diff --git a/setup.py b/setup.py
index 68999932..69a8fb28 100644
--- a/setup.py
+++ b/setup.py
@@ -2,7 +2,7 @@
 
 setup(
     name='djangocassandra',
-    version='0.4.3',
+    version='0.4.4',
     description='Cassandra support for the Django web framework',
     long_description=(
         'The Cassandra database backend for Django has been '