diff --git a/mayan/apps/documents/managers.py b/mayan/apps/documents/managers.py
index db8c8bff01..481b4d5d10 100644
--- a/mayan/apps/documents/managers.py
+++ b/mayan/apps/documents/managers.py
@@ -2,9 +2,9 @@ from __future__ import unicode_literals
 
 import logging
 
-from django.db import models, transaction
+from django.db import models
 
-from .settings import setting_recent_count, setting_language
+from .settings import setting_recent_count
 
 logger = logging.getLogger(__name__)
 
diff --git a/mayan/apps/documents/migrations/0013_document_is_stub.py b/mayan/apps/documents/migrations/0013_document_is_stub.py
index 6f110d024e..dd63cb203a 100644
--- a/mayan/apps/documents/migrations/0013_document_is_stub.py
+++ b/mayan/apps/documents/migrations/0013_document_is_stub.py
@@ -8,7 +8,7 @@ def make_existing_documents_not_stubs(apps, schema_editor):
     Document = apps.get_model('documents', 'Document')
 
     for document in Document.objects.all():
-        document.is_stub=False
+        document.is_stub = False
         document.save()
 
 
diff --git a/mayan/apps/documents/models.py b/mayan/apps/documents/models.py
index 199a47d8fa..95e43e3bd3 100644
--- a/mayan/apps/documents/models.py
+++ b/mayan/apps/documents/models.py
@@ -13,8 +13,6 @@ from django.utils.encoding import python_2_unicode_compatible
 from django.utils.timezone import now
 from django.utils.translation import ugettext_lazy as _
 
-from celery.execute import send_task
-
 from common.literals import TIME_DELTA_UNIT_CHOICES
 from common.models import SharedUploadedFile
 from common.settings import setting_temporary_directory
diff --git a/mayan/apps/documents/views.py b/mayan/apps/documents/views.py
index 727d2186cc..d1d9515614 100644
--- a/mayan/apps/documents/views.py
+++ b/mayan/apps/documents/views.py
@@ -51,8 +51,8 @@ from .permissions import (
     permission_document_view, permission_empty_trash
 )
 from .settings import (
-    setting_preview_size, setting_recent_count, setting_rotation_step,
-    setting_zoom_percent_step, setting_zoom_max_level, setting_zoom_min_level
+    setting_preview_size, setting_rotation_step, setting_zoom_percent_step,
+    setting_zoom_max_level, setting_zoom_min_level
 )
 from .tasks import (
     task_clear_image_cache, task_get_document_page_image,